Question # 1

When a silicon crystal is doped with a pentavalent element, such an extrinsic semi-conductor is called

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p-type semi-conductor

n-type semi-conductor

either of them

none of them

Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons

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Frequency

Penetrating power

Energy

Method of creation

The electrical forces between the molecules of a liquid are

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Repulsive

Attractive

Both A and B

None

Physics is one of the branches of:

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Social sciences

Physical sciences

Biological sciences

Abstract art

The space around the earth within which it expects a force of attraction on other bodies is known as:

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Nuclear field

Conservative field

Electric field

Gravitational field

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:

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Motion emf

Electrostatic emf

Induced emf

Both A and B

Both A and C

The types of mechanical energy is/are:

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Kinetic energy

Potential energy

Both of these

None of these

When a vector is multiplied by a negative number, its direction:

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Remains the same

Changes

Changes by 180°

None of these

When two spherical conducting balls at different potentials are joined by a metallic wire, after some time:

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Both the conductors are at the same potential

Potential difference across the conductors remain constant

Potential difference across the conductors becomes zero

Both (A) and (B)

Both (A) and (C)

The force experienced by a single charge carrier moving with velocity 'v' i magnetic field of strength 'B' is given by

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F =q(v/B)

F=q²(v x B)

F=q(v x B)

F= vx B

One KWh is equal to:

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3.6 x 10²J

3.6 KJ

3.6 x 10¹KJ

3.6 MJ

The Earth's potential is considered to be at

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Zero

Minimum

Maximum

Infinite

Multiplication of a vector is carried out by a

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Number

Direction

Number and direction

None of these

What is the unit of the Young's modulus?

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N m^-2

N m^-1

N m

N m²

Huygen principle is used to determine:

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Speed of light

Location of wavefront

About polarized and unpolarized light

None of them

Work done per unit charge is

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Electric Flux

Electric potential

Electric intensity

None of these

Shear modulus for water is

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- 4.7

- 3.3

- 1.2

0

Human body is composed of particles to produce electric force are

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Atoms

Molecules

Charges

All of them

On moving a charge of 20 coulombs by 2 cm,2J of work is done,then the potential difference between the points is

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0.1 V

8 V

3 V

0.5 V

Newton's first law of motion says a body will

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Remain at rest

Continuous move to with uniform velocity

Have no unbalanced external force act

All of these

X-ray crystallography can be used to get what information about the structure of a compound?

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the bond angles in a molecules

the number of molecules per unit cell

a picture of the electron density in a unit

all of them

The dimensions [MLT^-1] refers to the quantity

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Force

Momentum

Impulse

None of these

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