Question # 1

All are conductors except:

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Copper

Wires

Steel

Wood

Two bodies of masses m₁ and m₁ attached to the ends of an inextensible string passing over a frictionless pulley such that both move vertically. The acceleration of the bodies is:

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m1 x m₂ / m₁ + m₂ g

m₁ - m₂ / m₁ + m₂ g

m₁ + m₂ / m₁ - m₃ g

None of these

During recent years the percentage of __________ increased considerably on earth:

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Carbon dioxide

Nitrogen

Oxygen

Methane

The mathematical formula of thermal conductivity is

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k =Q/t x L/A (T1 - T2)

k =Q/t x L/A (T1 + T2)

k =t/Q x L/A (T1 - T2)

k =2Q/t x L/A (T1 + T2)

Which types of friction is minimum?

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Sliding

Limiting

Rolling

None

Which one of the following converts light energy into electrical energy?

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Electric bulb

Electric generator

Photo cell

Electric cell

Latent heat of vaporization is denoted by:

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H1

Hm

Hv

Hf

The type of hydrometer which is used to measure the concentration of acid in a battery is called:

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Chemical meter

Acid meter

Barometer

pH meter

Ice at ............ °C is more effective in cooling.

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0

-1

-2

-3

Perpendicular / hypotenuse is equal to:

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Cosθ

Tanθ

Cosecθ

Sinθ

Formula of Gravitational potential energy is:

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mgh

mg/h

1/2 mv²

None of these

A gradual large increase in atmospheric pressure shows:

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Pleasant condition

Rainy condition

Intense condition

Winday condition

A refrigerator is based on the principles of .

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Mechanics

Electricity

Thermodynamics

Electronics

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9th Class Physics English Medium KPK Boards Online Mcqs MCQs With Answers

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