Question # 1

Room are heated using gas heaters by:

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Conduction only

Convection and radiation

Radiation only

Convection only

The freezing point of Mercury is:

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49 ^oC

-49^oC

39^oC

-39^oC

Which instrument is most suitable to measure the internal diameter of a test tube.

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Metre rule

Vernier Callipers

Measuring tape

Screw gauge

Law of Gravitation is consistence with:

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1st Law of motion

2nd Law of motion

3rd Law of motion

Law of momentum

S.I unit of young's modulus is:

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Nm

Nm^-1

Nm^-2

Nm^-3

Heat travels from __________

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Colder to hotter

Hotter to colder

Both a & b are possible

None of above

Sliding friction can be changed into rolling friction by using:

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Ball bearing

Roller bearing

Both a and b

None of these

Rate of doing work is called

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Energy

Torque

Power

Momentum

The product of force and momentum arm is called:

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Couple arm

Torque

Rigid body

Axis of rotation

The devise used to measure the atmosphere pressure is:

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Rain gauge

Vacuum cleaner

Screw gauge

Barometer

S.I unit of G is:

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Nm^-2 kg²

Nm^-2Kg^-2

Nm²kg^-2

Nm²kg^-3

Momentum is quantity

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Scalar

Vector

Base

All

If the applied force is 'F' and its moment arm is 'r' then torque is defined as

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τ = rF

τ = r2F

τ = r + F

τ = 2rF

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