BSEK Karachi Physics Class 10 Past Paper 2023

1

Consider isotope $_{92}U^{235}$ of Uranium. The number of neutrons in it is:

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📅 2023

[1 Mark]

A

235

B

145

C

92

D

143

2

Oscillations are damped due to the presence of:

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📅 2023

[1 Mark]

A

Fractional force

B

Mechanical force

C

Restoring force

D

Linear motion

3

Branch of Physics which deals with the charges at rest is called:

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📅 2023

[1 Mark]

A

Electricity

B

Electrostatic

C

Quantum

D

Magnetism

4

ICT stands for:

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[1 Mark]

A

Interfacing computer Theories

B

Information and Communications Technology

C

Integrated Circular Technology

D

Intensive Computer Techniques

5

$V^2/R$ is the formula to find:

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[1 Mark]

A

current

B

charge

C

power

D

energy

6

The presences of dielectric between the plates of capacitors the capacitance of capacitor:

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[1 Mark]

A

decreases

B

remain unchanged

C

increases

D

remain constant

7

The focal length of convex lens is 20cm. The power of lens is:

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📅 2023

[1 Mark]

A

4 diopter

B

5 diopter

C

10 diopter

D

none of these

8

The colour that least deviated by a prism is:

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[1 Mark]

A

violet

B

red

C

yellow

D

green

9

These type of waves cannot travel through a vacuum:

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[1 Mark]

A

X-rays

B

Infrared waves

C

Microwaves

D

Sound waves

10

The main source of energy in the stars is:

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📅 2023

[1 Mark]

A

chemical reaction

B

nuclear fusion

C

Mechanical energy

D

nuclear fission

11

The turns ratio of a transformer is 10, it means:

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📅 2023

[1 Mark]

A

N_S = 10 N_P

B

I_S = 10 I_p

C

v_S = v_p

D

N_P = 10 N_S

12

The Boolean expression of an AND gate is:

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📅 2023

[1 Mark]

A

A \cdot B

B

A + B

C

A \times B

D

None of these