**Correct Answer : C**

**Explanation :**

∇⋅(∇×F)=0

Correct Answered :

Wrong Answered :

1. The Divergence of Curl is?

A

1

B

infinity

C

0

D

None of the above

Vector Physcics
MOCK
REPORT
VERIFIED
**Correct Answer : C**

**Explanation : **

∇⋅(∇×F)=0

Correct Answered :

Wrong Answered :

2. The Michelson–Morley experiment was designed to show :

A

The difference in the speed of light between directions parallel and perpendicular to the Earth’s motion

B

The speed of light in vacuum is not invariant

C

That Galilean transformation equations are valid for the speed of light to be invariant

D

None of the above

Wave Physics
KU Physics 2021
REPORT
**Correct Answer : A**

**Explanation : **

A

Correct Answered :

Wrong Answered :

3. In free space, the Poisson equation for electrostatics becomes :

A

The Maxwell’s equation.

B

The Laplace equation

C

The steady state continuity equation

D

The Ampere’s circuital law

Electrostatics
KU Physics 2021
REPORT
**Correct Answer : B**

**Explanation : **

In free space, the Poisson equation for electrostatics is given by: ∇²V(r) = - ρ(r) / ε₀ Where: V(r) is the electrostatic potential at a point in space ∇² is the Laplacian operator, representing the divergence of the gradient of the potential ρ(r) is the charge density at a point in space ε₀ is the electric constant, a fundamental physical constant with a value of approximately 8.854 x 10^-12 C^2/Nm^2. but charge density is 0 in free space so we are left with Laplace equation

Correct Answered :

Wrong Answered :

4. An astronaut sees two spaceships flying apart with
speed 0.99c. The speed of one spaceship as viewed
by the other nearly is :

A

(A) 0.99995c

B

(B) c

C

(C) 0.95555c

D

(D) 0 c

Relativity
KU Physics 2021
REPORT
**Correct Answer : A**

**Explanation : **

Va|b = (Va - Vb)/(1 + Va*Vb/c^2)

Correct Answered :

Wrong Answered :

5. The graph of the function as shown in Fig.1 is best described by :

A

e^x* cos(x)

B

e^–x *cos(x)

C

e^x *sin(x)

D

e^ –x *sin(x)

Functions
KU Physics 2021
REPORT
**Correct Answer : C**

**Explanation : **

C

Correct Answered :

Wrong Answered :

6. Choose the incorrect statement :

A

If total linear momentum of a system of particles is zero, the angular momentum of the system is the same around all origins

B

Even if total linear momentum of a system of particles is not zero, the angular momentum of the system is same around all origins

C

If the total force on a system of particles is zero, the torque on the system is the same around all origins

D

When a rigid body rotates around an axis, every particle in the body remains at a fixed distance from the axis

Classical Mechanics
KU Physics 2021
REPORT
**Correct Answer : B**

**Explanation : **

B

Correct Answered :

Wrong Answered :

7. If F is the time-dependent force F = A – Bt, where
A and B are positive constants, the velocity v(t) in
terms of A, B, m (mass), v0
(initial velocity) and x0
(initial
position) is given by :

A

v(t) = v0 + At /m – B t2 /2m

B

v(t) = v0 + At2 /m – B t/2m

C

v(t) = v0 + B t2 /2m

D

v(t) = v0 – B t2 /2m

Classical Mechanics
KU Physics 2021
REPORT
**Correct Answer : A**

**Explanation : **

A

Correct Answered :

Wrong Answered :

8. How far approximately will a small boat move, when
a man with mass 64 kg moves from back to front of
the boat ? Given that length of boat is 2.7 m, its mass
is 92 kg. (Water resistance and tilt of the boat is
negligible)

A

1.03 m

B

1.40 m

C

2.74 m

D

1.10 m

Classical Mechanics
KU Physics 2021
REPORT
**Correct Answer : D**

**Explanation : **

center of mass will remain at same point

Correct Answered :

Wrong Answered :

9. A particle moves in a circular orbit with the potential
energy U(r) = –A/r^n , where A > 0. For what values of
‘n’ are the circular orbits stable :

A

n > 2

B

n <= 2

C

Only for n = 2

D

Only for n = 1

Classical Mechanics
KU Physics 2021
REPORT
**Correct Answer : B**

**Explanation : **

B

Correct Answered :

Wrong Answered :

10.

A particle of mass ‘m’ is located in the y-z plane at x = 0, y = 3, z =3. Its moment and products of inertia relative to the origin written in the form of an Inertia matrix are :

A

A

B

B

C

C

D

D

Classical Mechanics
KU Physics 2021
REPORT
**Correct Answer : A**

**Explanation : **

A

Correct Answered :

Wrong Answered :

11. A marble of mass 0.1 kg and radius 0.25 m is rolled
up a plane of angle 30 degree . If the initial velocity of the
marble is 2 m/s, the distance ‘d’ it travels up the plane
before it begins to roll back down is equal to :

A

4 m

B

4/5 m

C

4/7 m

D

4/9 m

Classical Mechanics
KU Physics 2021
REPORT
**Correct Answer : C**

**Explanation : **

C

Correct Answered :

Wrong Answered :

12. A thin sheet of mass M is in the shape of an equilateral
triangle with side L. The moment of inertia around an
axis through a vertex, perpendicular to the sheet is :

A

5/7 ML^2

B

5/12 ML^2

C

5/9 ML^2

D

1/2 ML^2

Classical Mechanics
KU Physics 2021
REPORT
**Correct Answer : B**

**Explanation : **

B

Correct Answered :

Wrong Answered :

13.

If a force F is derivable from a potential function V(r),

where r is the distance from the origin of the coordinate

system, it follows that :

A

∇ × F = 0

B

∇· F = 0

C

∇V=0

D

∇^2 V=0

Classical Mechanics
KU Physics 2021
REPORT
**Correct Answer : A**

**Explanation : **

A

Correct Answered :

Wrong Answered :

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