Practise All MCQs in Lecturer Physics Past Papers and Syllabus. Attempt multiple-choice questions, check answers and revise related subtopics.
Study All through multiple-choice questions in Lecturer Physics Past Papers and Syllabus. This subtopic contains 342 practice questions. Read the wording carefully, compare the options and attempt an answer before checking the solution in learning mode.
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کس قسم کے برقی مقناطیسی تابکاری میں سب سے کم طول موج اور اعلی ترین توانائی ہے؟
Answer: Gamma rays
Explanation Gamma rays have the shortest wavelength and highest energy in the electromagnetic spectrum. They are produced in nuclear reactions . They are used in medical treatments and scientific research.
Answer: 2 x 10^-9/sec
Explanation The collision frequency is 2 × 10^9 collisions per second, which can also be expressed as 2 x 10^-9/sec.
ایک مثالی گیس کے لئے ایک آئیسوتھرمل عمل _____ کے ذریعہ پی_وی آریگرام پر نمائندگی کیا جاتا ہے؟
Answer: A portion of a hyperbola
Explanation In an isothermal process , temperature remains constant, so PV = constant , forming a hyperbolic curve on a P-V diagram. This follows Boyle’s Law (P ∝ 1/V) for an ideal gas.
Answer: -2
Explanation For a vector field to be solenoidal, its divergence must be zero. The divergence of a vector field A = (x + 3y)i + (y - 2z)j + (x + mz)k is given by ∇ ⋅ A = ∂(x + 3y)/∂x + ∂(y - 2z)/∂y + ∂(x + mz)/∂z. Calculating the divergence : ∇ ⋅ A = 1 + 1 + m For the field to be solenoidal (∇ ⋅ A = 0), m must be -2.
ٹرانسفارمر کا اصول _____ ہے؟
Answer: Mutual induction
Explanation A transformer works on the principle of mutual induction , where a changing current in the primary coil induces a voltage in the secondary coil. This is based on Faraday's Law of Electromagnetic Induction , which states that a changing magnetic field produces an electromotive force (emf).
تسلسل کے ایس آئی یونٹ کیا ہے؟
Answer: NS
Explanation Impulse is defined as the product of force and time ( Impulse = Force × Time ). The SI unit of impulse is Newton-second (NS) , which is equivalent to kg·m/s (momentum unit).
آواز کو ریکارڈ کرنے کے لئے مندرجہ ذیل میں سے کون سا آلات استعمال ہوتا ہے؟
Answer: Phonograph
Explanation Phonograph is a device used to record and reproduce sound mechanically. Dictaphone records voice but is mainly for dictation. While an amplifier only increases sound volume.
چاند پر ویکیوم میں ایک پنکھ اور لیڈ بال کو باقی سے گرا دیا جاتا ہے۔ پنکھ کی تیزرفتاری ______ ہے؟
Answer: The same as that of the lead ball
Explanation In a vacuum, there is no air resistance, so all objects fall with the same acceleration due to gravity. On the Moon, the acceleration due to gravity is about 1.63 m/s² , and both the feather and the lead ball will fall at this rate.
میں تقریبا 1500 جزیرے ہیں؟ ______
Answer: Finland
Explanation Finland is known for its extensive archipelago, with approximately 1500 islands. This makes it one of the countries with the most islands in the world.
وین کی نقل مکانی کا قانون ______ ہے؟
Answer: 𝜆𝑚𝑇= constant
Explanation Wien's Displacement Law states that the product of the wavelength at which a blackbody emits maximum intensity ( λ m lambda_m ) and its absolute temperature ( T T ) is constant: λ m T = constant lambda_m T = text{constant} . It explains the inverse relationship between temperature and peak wavelength . It meaning hotter objects emit radiation at shorter wavelengths.
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