Question # 1

The nature of radiations emitted by a hot body depends upon its:

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Metarial

Temperature

colour

Volume

Length

Which one of the following is dimensionless:

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Acceleration

Velocity

Density

Angle

Conversion of chemical energy to electrical energy can be achieved by:

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Primary cell

Secondary cell

Both (A) and (B)

Photovoltaic cell

Solar cell

Which force is not a conservative force?

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Frictional force

Gravitational force

Electric force

Elastic spring force

According to kinetic theory of gases, molecules of a gas behave like

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Inelastic spheres

Perfectly elastic rigid sphere

Perfectly elastic non-rigid spheres

Inelastic non-rigid spheres

The positive charge moving in one direction is equivalent in all external affects to a:

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Negative charge is moving in the same direction

Positive charge is moving in the opposite direction

Negative charge moving in the opposite direction

Positive charges moving in the same direction

None of these

A toy car moves around a circular track of radius 0.3 m at the rate of 120 rev/min. The speed V of the car is:

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38 m/sec

3.8 m/sec

0.6 m/sec

None of these

Taking the earth to be a spherical conductor of diameter 12.8 x 10³km. Its capacity will be

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711μF

611μF

811μF

511μF

The general theory of relativity treats problems involving

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inertial frame of references

accelerating frame of references

both of these

none of these

The concept of entropy was introduced into the study of thermodynamics in

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1856

1865

1656

1685

When the pn-junction is forward biased. the current flows through it is of the order of

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mili-amperes

amperes

nano-amperes

micro-amperes

Pico is the prefix for

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10^-10

10^-12

10^-15

10^-18

When the object lies between F and 2F the image formed by a convex lens is

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Real

Virtual

Diminished

Erect

A paratrooper is an example of

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Static equilibrium

Dynamic Equilibrium

Both static and dynamic equilibrium

None of these

When a shell explodes a mid-air, the total momentum of its fragments is

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less than the momentum of shell

equal to the momentum of shell

greater than the momentum of shell

none of them

For a fixed force, larger is the mass of a body

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Greater acceleration

Small acceleration

Same acceleration

None of these

The number 134.7 should be written as

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13.47 × 10²

1.347 × 10²

13.47 × 10³

None of these

The nature of thermal radiation is similar to:

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Ultraviolet rays

Light rays

Both of them

None of them

If at a pressure of 10⁵Nm^-2, the density of oxygen is 1.4 Kgm^-3the rms velocity of oxygen molecule in ms^-1is

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18

120

270

460

Which of the following light move faster in water

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Red

Violet

Green

Blue

The synchronous satellites are very useful for

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Worldwide communicatioin

Weather observations

Navigation

All of these

When there are number of forces acting on a body and the body is

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At rest

Motion

Rest or moving with uniform velocity

None of these

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