<p><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">মডেল প্রশ্ন</span></span></span></span></span></p> <p><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">বহু নির্বাচনী প্রশ্ন</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">১।       পানির ত্রৈধবিন্দুর তাপমাত্রা</span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">—</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক)  </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">263.16 K</span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">      খ)  </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">253.16 K</span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">         গ)  </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">373.16 K</span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ঘ)  </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">273.16 K</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">২।       তাপ আপনা হতে শীতল বস্তু থেকে উষ্ণ বস্তুতে প্রবাহিত হতে পারে না। এটি  সূত্রের বিবৃতি।</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) তাপগতিবিদ্যার প্রথম </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  খ) তাপগতিবিদ্যার দ্বিতীয়   </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) তাপগতিবিদ্যার তৃতীয়  </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ঘ) তাপগতিবিদ্যার শূন্যতম</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">৩। এনট্রপির </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">SI </span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">একক হলো</span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">—</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">JK<sup>1</sup></span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  খ) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">Jkg<sup>-1</sup>          </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">Jkg<sup>-1</sup>K<sup>1</sup></span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ঘ) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">J</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">৪। একটি কার্নো ইঞ্জিন </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">230<sup>0</sup> C</span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black"> ও </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">27<sup>0</sup> C </span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">তাপমাত্রার কাজ করছে। এর কর্মদক্ষতা কত?</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">90%</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  খ) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">50% </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">53%</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ঘ) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">20%</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">৫। একটি আহিত ধারকে শক্তি সঞ্চিত থাকে</span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">—</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) ধনাত্মক প্লেটে   </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  খ) প্লেটের মধ্যবর্তী তড়িেক্ষত্রে  </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) ঋণাত্মক ও ধনাত্মক প্লেটে    ঘ) প্লেট দুটির প্রান্তের চারপাশে।</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">৬। একটি পরিবাহকের ধারকত্ব </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">40 F</span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">। এতে কত আধান প্রদান করলে এর বিভব </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">8 V</span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black"> হবে</span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">—</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">5 C</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  খ) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">320 C  </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">160 C</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ঘ) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">240 C</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">৭। সমান ধারকত্বের দুটি ধারকের সমান্তরাল সংযোজনী ধারকত্ব শ্রেণিবদ্ধ ধারকত্বের কত গুণ?</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) সমান    খ) চার গুণ  </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) তিন গুণ  ঘ) দ্বিগুণ</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">৮। মিটার ব্রিজ কোন নীতি অনুসারে কাজ করে?</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) অ্যাম্পিয়ারের সূত্র </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  খ) হুইটস্টোন ব্রিজ নীতি   </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) ফার্মাটের নীতি  </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ঘ) কার্শফের সূত্র</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">৯। কোনো পরিবাহীর দৈর্ঘ্য ও প্রস্থচ্ছেদের ক্ষেত্রফল একই থাকলে তাপমাত্রা বৃদ্ধির ফলে এর রোধ কী হবে?</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) বৃদ্ধি পাবে খ) হ্রাস পাবে    গ) একই থাকবে  ঘ) তাপমাত্রার বর্গের সঙ্গে পরিবর্তিত হবে</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">১০।      একই রোধের দুটি তামার তারের দৈর্ঘ্যের অনুপাত </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">1:2</span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">। এদের ব্যাসের অনুপাত কত?</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">1:2</span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">      খ) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">2:1  </span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">গ) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">1:Ã2</span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">     ঘ) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">Ã2:1</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">১১।      একটি তারকে দৈর্ঘ্যে দ্বিগুণ করলে এবং প্রস্থচ্ছেদের ক্ষেত্রফল অর্ধেক করলে এর রোধ</span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">—</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) দ্বিগুণ হবে </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  খ) অর্ধেক হবে </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) অপরিবর্তিত থাকবে    ঘ) চার গুণ হবে</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">১২।      কোনটির ফোটনের শক্তি সবচেয়ে কম?</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) অবলোহিত </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  খ) মাইক্রোওয়েভ</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) রেডিও ওয়েভ  ঘ) অতিবেগুনি</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">১৩।ইয়ংয়ের দ্বি-চিড় পরীক্ষায় চিড় ও পর্দার ব্যবধান বাড়লে ডোরার ব্যবধান ও প্রস্থ</span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">—</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) কমে     </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  খ) বাড়ে</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) একই থাকে</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ঘ) কোনো সম্পর্ক নেই</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">১৪।      আলোর তড়িত্চুম্বকীয় তত্ত্বের সাহায্যে কোনটি ব্যাখ্যা করা যায়?</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) সমবর্তন  </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  খ) আলোক তড়িৎ নিঃসরণ </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) অপবর্তন</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ঘ) প্রতিসরণ</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">১৫।      বিশেষ আপেক্ষিক তত্ত্ব অনুযায়ী একটি বস্তুকণা আলোর গতিতে চলতে পারে না, কারণ</span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">—</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) বেগ শীঘ্র অসীম হবে  </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  খ) ভর অসীম হবে  </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) কণা রশ্মি বিকিরণ করবে  ঘ) ভর কমে শূন্য হবে</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">১৬।      আলোক তড়িৎ ক্রিয়া সমর্থন করে আলোর</span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">—</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) কণা তত্ত্ব      খ) তরঙ্গ তত্ত্ব </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">গ) কোয়ান্টাম তত্ত্ব  ঘ) তড়িচ্চুম্বকীয় তত্ত্ব</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">১৭।      অত্যন্ত দ্রুতগতিসম্পন্ন ইলেকট্রনকে কোনো ভারী ধাতব বস্তু দ্বারা থামিয়ে দিলে উৎপন্ন হয়</span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">—</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) গামা রশ্মি খ) অতিবেগুনি রশ্মি </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) এক্স-রে</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ঘ) অবলোহিত বিকিরণ</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">১৮।      আইনস্টাইনের আপেক্ষিক তত্ত্ব অনুসারে বেগ বাড়লে ভর</span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">—</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) স্থির থাকবে খ) কমবে</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) বাড়বে  </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ঘ) শক্তিতে রূপান্তরিত হবে</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">১৯।      রেডনের অর্ধায়ু </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">6.93 days</span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">। এর গড় আয়ু কত?</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">7 days</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  খ) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">8 days  </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">9 days</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ঘ) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">10 days</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">২০।      গামা রশ্মি</span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">—</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) ফোটন    খ) ইলেকট্রন</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) প্রোটন    ঘ) নিউট্রন</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">২১।      সূর্যে হাইড্রোজেন থেকে হিলিয়াম তৈরি হয় কোন পদ্ধতিতে?</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) তেজস্ক্রিয় ক্ষয়   খ) ফিউশন  </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) ফিশান    ঘ) ভাঙন</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">২২।      ডোপান্ট কী?</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) অপরিবাহীর সাথে মিশ্রিত অপদ্রব্য</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  খ) অর্ধপরিবাহীর সাথে মিশ্রিত অপদ্রব্য</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) পরিবাহীর সাথে মিশ্রিত অপদ্রব্য</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ঘ) পরিবাহীর সাথে অপরিবাহীর মিশ্রণ</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">২৩।      তাপমাত্রা বাড়ালে অর্ধপরিবাহীর রোধ</span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">—</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) কমবে খ) বৃদ্ধি পাবে</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) পরিবর্তন হবে না     </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ঘ) শূন্য হবে</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">২৪। দিক পরিবর্তী প্রবাহকে একমুখী প্রবাহে পরিণত করে কোনটি?</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) ক্যাপাসিটর     খ) রেক্টিফায়ার</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) ট্রানজিস্টর      ঘ) অ্যামপ্লিফায়ার</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">২৫।      তড়িৎ ক্ষেত্রের মান (প্রাবল্যের মান)   নির্ণয় করা যায়</span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">—</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">     i. </span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">কুলম্বের সূত্র থেকে      </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">     ii. </span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">অ্যাম্পিয়ারের সূত্র থেকে</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">     iii. </span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">গাউসের সূত্র থেকে</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  নিচের কোনটি সঠিক?</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ক) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">i </span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">ও </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">ii</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  খ)</span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black"> i </span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">ও </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">iii  </span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  গ) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">ii </span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">ও </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">iii</span></span></span></span></span></p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  ঘ) </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">i, ii </span></span></span><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">ও </span></span></span><span style="font-size:14.0pt"><span style="font-family:"Times New Roman","serif""><span style="color:black">iii</span></span></span></span></span></p> <p style="margin-left:24px"> </p> <p style="margin-left:24px"><span style="font-size:11pt"><span style="font-family:"Calibri","sans-serif""><span style="font-size:14.0pt"><span style="font-family:SolaimanLipi"><span style="color:black">  উত্তর : ১. ঘ ২. খ ৩. ক ৪. ঘ ৫. খ ৬. খ ৭. খ ৮. ঘ ৯. খ ১০. খ ১১. গ ১২. ঘ ১৩. গ ১৪. খ ১৫. ক ১৬. খ ১৭. গ ১৮. গ ১৯. গ ২০. ঘ ২১. ক ২২. খ ২৩. খ ২৪. ক ২৫. ঘ।</span></span></span></span></span></p>