Question # 1

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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thermoionic electrons

free electrons

photoelectrons

slow electrons

The waves produced in a microwave oven have frequency

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2450 Hz

2450 K Hz

2450 M Hz

2450 G Hz

A conducting wire is drawn to double its length. Final resistivity of the material will be

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Double of the original one

Half of the original one

One fourth of the original one

Same as original one

Fire fighters have jet attached to the head of their water pipes in order to

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Increase the mass of water flowing per second

Increase the velocity of water flowing out

Increase the volume of water flowing per second

Avoid wastage of water

During the nuclear changes, the law/s of conservation that hold/s are that of:

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Charge

energy

Momentum

Mass

All of these

Experiments revealed that the ratio of the stress to the strain is a constant value for

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different material

all materials

a given material

all of them

Work is a scalar product of

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Force, Velocity

Velocity, Displacement

Force, Displacement

Force, Momentum

Motional emf is called motional:

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Electromagnetic force and is measured in newtons

Electromotive force and is measured in volt

Electromotive force and is measured in newtons

Electromagnetic force and is measured in volts

None of these

A current of 1.6 A is passed through a solution of CuSO_{4. How many Cu}²⁺ions are liberated in one minute?

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3 x 10²⁰

3 x 10¹⁰

6 x 10²⁰

6 x 10¹⁰

The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be

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1 : 2

4 : 1

1 : 4

2 : 1

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

In semiconductors, at 0 K, the electrons in conduction band is

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Partially filled

No

Yes

None of these

The flow is said to be streamline or laminar when very particle

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Moves in different direction

Moves along the same path as

Slowly moves in one direction

None of these

Fluid friction of a spherical body depend on the

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Shape

Size

Orientation

All of these

The effect is to increase the inflating the bag is

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To compress the blood vessels

To increase external pressure

To cut off the flow of blood

All of these

The direction of the angular velocity vector is along

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The tangent to the circular path

The inward radius

The outward radius

The axis of rotation

The Dimension of acceleration is

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[L²T]

[LT²]

[LT^-2]

None of these

In conductors, the valence band and conduction bands are

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Touch each other

Overlapped each other

Largely overlapped

None of these

The resultant of two equal forces is double of either of the forces. The angle between them is

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120°

90°

60°

180°

Solid Angle can be _________ only.

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Practically measure

theoretically measure

Both a and b

Sometimes practically measure and sometimes theoretically measure

When a body is moving on a surface the force of friction is called

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Static friction

Dynamic firction

Limiting friction

Rolling friction

The diffraction of light occurs, due to interference, of

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Obstructed portion

Unobstructed portion

Both obstructed and unobstructed light

None of these

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