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Physics MCQs With Answers For PPSC

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Physics MCQs Objective Type Question Answers Quiz Test

Punjab Public Service Commission Physics MCQs Quiz Test

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Physics Objective Type Solved MCQs With Answers

Q.1: The number 76.85 is rounded off up to two significant figures as------- ?

1. 76.8
2. 77
3. 76.9
4. None of these

B

Q.2: The period of a circular motion is given by------- ?

1. T = πv
2. T = πw
3. T = 2πr
4. T = 2πr/v

D

Q.3: What is the outward force acting on a mass of 10 kg when rotating at one end an inelastic string 10m long at speed of 1m/s ?

1. 1N
2. 10N
3. 2N
4. 100N

A

Q.4: If a car moves with a uniform speed of 2 ms-1 in a circle of radius 0.4. Its angular speed is-------- ?

1. 4 ra
2. S-1
3. 5 ra
4. S-1
5. 1.6 ra
6. S-1
7. 2.8 ms-1

B

Q.5: If a body of mass 10 kg is allowed to fall freely, its weight becomes--------- ?

1. 0
2. 89N
3. 9.8 N
4. 10N

A

Q.6: The drag force is given by----------- ?

1. Newtons law
2. Pascals law
3. Gauss law
4. Stokes law

D

Q.7: Concentration of red cells in blood is about------ ?

1. 25%
2. 40%
3. 50%
4. 75%

C

Q.8: The effect of the decrease in pressure with the increase of the speed of the fluid in a horizontal pipe is known as--------- ?

1. Bernoulli effect
2. Torricelli effect
3. Venturi effect
4. Stokes effect

C

Q.9: The speed of the fluid is maximum in the venturi meter at--------- ?

1. Convergent duct
2. Divergent duct
3. Throat
4. None of these

D

Q.10: The frequency of the second pendulum is-------- ?

1. 1 hertz
2. 0.5 hertz
3. 1.5 hertz
4. 2.5 hertz

B

Q.11: For what displacement the P.E becomes 1/4 of its maximum value ?

1. x = x’
2. x = x’/2
3. x = x’/4
4. x = x(2)’/2

B

Q.12: A convex lens acts as a diverging lens if the--------- ?

1. object is beyond C
2. if the object is with in C
3. if the object is within f
4. both B and C

D

Q.13: The mass attached to a spring executes ?

1. Vibratory motion
2. Rotatory motion
3. S.H.M
4. Both A and C

D

Q.14: Mark the wrong statement ?

1. a frame of reference which is either at rest or moves with a constant velocity is called an inertial frame of reference
2. an un-accelerated frame of reference is called an inertial frame of reference
3. all the frames of reference in uniform rectilinear motion are equivalent
4. Newtons laws of motion are valid in an accelerated (non inertial) frame of reference

D

Q.15: Einstein’s photoelectric equation is given by------- ?

1. 1/2 mvmax2=hf+Φ
2. 1/2 mvmax2-hf = Φ
3. 1/2 mvmax2=hf-Φ
4. All of above are correct

C

Q.16: If a photon is reflected from the mirror then the change in momentum of each photon is--------- ?

1. Zero
2. Double
3. Half
4. 1

B

Q.17: In an electron microscope, we use energetic particles because of--------- ?

1. Penetrating power is high
2. Kinetic energy is large
3. Wavelength is very short
4. All the above reasons

C

Q.18: If an object is placed away from 2f of a converging lens then the image will be--------- ?

1. real and erect
2. virtual and erect
3. real and inverted
4. virtual

C

Q.19: For normal adjustment, length of astronomical telescope is--------- ?

1. fo + fe
2. fo – fe
3. fo / fe
4. fe / fo

A

Q.20: Errors in the transmission of power through optic fiber can be minimized by using a--------- ?

1. Multimode index fiber
2. Graded index fiber
3. Single mode step index fiber
4. Copper wire

B