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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لاکٹ کی مدت اس کے _____ کے ذریعہ طے کی جاتی ہے؟
Answer: Length
Explanation The period of a simple pendulum is directly proportional to the square root of its length (T ∝ √L). Mass and amplitude do not affect the period in an ideal simple pendulum.
مندرجہ ذیل میں سے کون سے کسی کو ایوومیٹر سے ماپا نہیں جاسکتا؟
Answer: Inductance
Explanation An Avometer (Ammeter-Voltmeter-Ohmmeter) can measure voltage (V), current (A), and resistance (Ω) but not inductance (L) . Inductance is measured using an LCR meter or an inductance bridge , not a standard Avometer.
مونوٹومک گیس کی صورت میں آزادی کی ڈگری کیا ہے؟
Answer: 3
Explanation The degrees of freedom refer to the number of independent ways a gas molecule can store energy. For a monoatomic gas (e.g., noble gases like helium, neon, argon): It has only translational motion along the x, y, and z axes . There are no rotational or vibrational degrees of freedom. Thus, the total degrees of freedom for a monoatomic gas is 3 (one for each spatial direction: x, y, and z ) .
پی این ڈایڈڈ میں ممکنہ رکاوٹ کی وجہ ______ ہے؟
Answer: Depletion of positive and negative charges near the junction
Explanation The potential barrier in a PN diode is caused by the depletion region, where mobile positive and negative charges near the junction diffuse and leave behind immobile ions. This depletion creates an electric field that opposes further charge movement, forming the potential barrier.
افقی محوروں پر دو یکساں دائرے محو ہیں جو ان کی سطحوں پر ٹینجینٹ ہیں۔ ایک طویل مدت کے ساتھ ایک ہے جس میں _______ ہے؟
Answer: The larger radius
Explanation The period of a physical pendulum depends on the rotational inertia and the distance from the pivot. A larger radius increases the moment of inertia, leading to a longer period of oscillation.
اگر سورج کا درجہ حرارت دوگنا کر دیا جائے تو زمین پر حاصل ہونے والی توانائی کی شرح کس عنصر سے بڑھ جائے گی؟
Answer: 16
Explanation The energy received from the sun on earth is proportional to the square of the temperature of the sun ( Stefan-Boltzmann law ). If the temperature of the sun is doubled, the energy received on earth will increase by a factor of 2^2 = 4. However, since the energy is also proportional to the square of the radius of the sun, and the radius remains constant, the total increase in energy received is 4^2 = 16. So, if the temperature of the sun is doubled, the rate of energy received on earth will be increased by a factor of 16.
Answer: 3
Explanation Given the correct understanding of the total angular momentum (J) formula: J = |l - s| to J = l + s With s = 1 and l = 1: J = |1 - 1|, 1, 1 + 1 J = 0, 1, 2 Indeed, there are three possible values of J: 0, 1, and 2.
ایک انقلاب ______ جیسا ہے؟
Answer: 2π rad
Explanation One complete revolution (360°) in radians is given by 2 π 2pi radians. This is because the circumference of a unit circle is 2 π 2pi , which corresponds to one full rotation.
ایک بند آرگن پائپ ایئر کالم کا تیسرا اوور ٹون پیدا کرنے کے لیے پرجوش ہے۔ معلوم ہوا کہ پائپ میں ہوا ______ ہے؟
Answer: Four needs and three antinodes
Explanation In a closed organ pipe , only odd harmonics are present, and the third overtone corresponds to the 7th harmonic. It has four nodes and three antinodes. The pattern alternates between nodes (points of no displacement) and antinodes (points of maximum displacement) in the air column.
سرنگ کا اثر ایک ممکن ____ ہے؟
Answer: Alpha decay
Explanation Quantum tunneling allows alpha particles to escape the nuclear potential barrier , making alpha decay possible . This effect occurs when the energy of the particle is lower than the barrier , but due to wavefunction probability , it can still pass through.
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