Question # 1

The pattern of NaCl particles have a shape which is :

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Cubic

Body centred cubic

Simple cubic

face centred

Both (A) and (C)

The electric field lines start from:

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Positive charge

Negative charge

Either A and B

Neutron

An atom

At the temperature, a body emits radiation which is principally

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of long wavelengths in the visible region

of long wavelengths in the invisible infrared region

of short wavelength in invisible ultraviolet region

none of these

The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:

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Lummer

Planck

Pringsheim

Both (A ) and (B)

Both (A) and (C)

Example of vibratory motion is

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mass suspended from a spring

a bob of simple pendulum

mass attached to a spring placed

all of them

The contrast in the fringes in an interference pattern depends upon

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Fringe width

Relative difference intensities of the two sources

Distance between the slits

Wavelength

To hear a clear echo, the reflecting surface must be at a minimum distance of

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10 m

16.5 m

33 m

66 m

Distance to nearest galaxy from earth is

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10¹⁰m

10¹⁵m

10⁴⁰m

10³⁰m

The nature of thermal radiation is similar to:

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Ultraviolet rays

Light rays

Both of them

None of these

A 60 W bulb operates on 220 V supply. The current flowing through the bulb is

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11/3 A

3 A

3/11 A

6

Neutron was discovered in

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1915

1920

1925

1932

Acceleration is a physical quantity which is

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Scalar quantity

Vector quantity

Constant quantity

None of these

The projectile is the motion which is

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One dimensional

Two dimensional

Three dimensional

None of these

The angle between A and B is θ.The value of the triple product A,(B x A) is:

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A²B

Zero

A²B sin θ

A²B Cos θ

If both the length and radius of rod are doubled, then the modulus of elasticity will:

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Increase

Decrease

Remains the same

Doubled

Solar energy at normal incidence outsides the Earth atmosphere is about

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1.043 Wm^-2

1.2 Wm^-2

1.4 Wm^-2

1.67 Wm^-2

To get p-type semiconductor we add impurity from

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3^rd group

4^th group

5^th group

6^th group

The light signals are sent from the source

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A ordinary source

A monochromatic light source

A moulticolour source

None of these

A ball is thrown upwards with a velocity of 100 m/s.It will reach the ground after

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10 s

20 s

5 s

40 s

A ball of mass m moving with uniform speed collides elastically with another stationary ball.The incident ball will lose maximum kinetic energy when mass of the stationary ball is:

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m

2 m

4 m

Infinity

For the normal setting of a telescope

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Only the object is at infinity

Only the final image is at infinity

Both the object and the final image is at infinity

Neither the object nor the final image has to be at infinity

The kinetic energy of a body of mass 2 kg and momentum of 2 Ns is

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1 J

2 J

3 J

4 J

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