SPSC Lecturer Physics Past Papers 2000 to till date

Q81: For an electronic state s = 1, and 1 = 1, the number of possible values of total angular momentum of an electronic are _____?

2

3

4

None of these

Q82: The equation E = mc^2 indicates that energy _____?

Is fundamentally different than mass

And mass are closely related

Equals mass moving at the speed of the light square

None of these

Explanation

Einstein’s equation $E = mc^2$ shows that energy and mass are interchangeable, meaning mass can be converted into energy and vice versa.

This principle is fundamental in nuclear reactions, where small amounts of mass release large amounts of energy.

Q83: Relativistic Mechanics produces results different from classical mechanics for bodily?

متعلقہ میکانکس جسمانی طور پر کلاسیکی میکانکس سے مختلف نتائج پیدا کرتا ہے؟

Zero velocity

Low velocities

Very high velocities

None of these

Explanation

Relativistic mechanics differs from classical mechanics when objects move at speeds close to the speed of light ( $v approx c$ ).

At low velocities, classical mechanics gives accurate results, but at very high velocities, effects like time dilation and mass increase become significant.

Q84: During one oscillation, phase of oscillation changes by _____?

ایک دوہری کے دوران ، _____ کے ذریعہ دوئم کے مرحلے میں تبدیلی آتی ہے؟

π⁄2 rad

π rad

2π rad

None of these

Explanation

In one complete oscillation (one full cycle), the phase of an oscillating system changes by $2pi$ radians.

This corresponds to the system returning to its starting position in a periodic motion, such as simple harmonic motion.

Q85: Canonical transformations can often be conveniently found or verified by using a ______?

کا استعمال کرکے کیننیکل تبدیلیاں اکثر آسانی سے پائی جاسکتی ہیں یا اس کی تصدیق کی جاسکتی ہیں؟ _____

Separation tensor

Degenerating function

Generating function

None of these

Q86: Divergence of a vector at a point in a vector field is _____ quantity.

ویکٹر فیلڈ میں ایک نقطہ پر ویکٹر کا انحراف _____ مقدار ہے۔

A scalar

A vector

Both A and B

None of these

Q87: Which of the following is the correct relation between current density and magnetization?

موجودہ کثافت اور میگنیٹائزیشن کے مابین مندرجہ ذیل میں سے کون سا صحیح تعلق ہے؟

J = Grad(M)

J = Div(M)

J = Curl(M)

None of these

Explanation

The correct relation between current density ( $mathbf{J}$ ) and magnetization ( $mathbf{M}$ ) is: $J = \nabla \times M$

This equation describes how the curl of magnetization produces bound current density in magnetized materials.

Q88: A student added three figures 72.1, 3.32 and 0.003. The correct answer regrading the rules of the addition of the significant figures will be ______?

75.4

75

75.42

None of these

Q89: An isotope is _____?

ایک آسوٹوپ _____ ہے؟

An atom with a specified number of protons and neutrons

The nucleus of the atom

A subatomic particle

None of these

Q90: Which first country among the following has withdrawn from the Paris Climate Accord/Agreement?

پیرس آب و ہوا کے معاہدے سے مندرجہ ذیل میں سے کون سا پہلا ملک واپس لے گیا ہے؟

India

Australia

USA

Russia