Question # 1

The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will

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Increase

Decrease

Remain F

Become 10F/9

Crystalline solids are in the form of:

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Metals

Ionic Compounds

Ceramics

Both (A) and (B)

All of these

All trigonometric functions (sine, cosine, tangent etc) are positive in:

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1st quadrant

2nd quadrant

3rd quadrant

4th quadrant

When the same object is viewed at a shorter distance, the image on the retina of the eye is _____ the so the object appears:

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Greater, smaller

Smaller, smaller

Smaller, larger

Greater, larger

Zirconia is classified as:

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Ceramic solid

Ionic compound

Metal

Either (A) or (B)

Either (B) or (C)

Origin of the electric and the gravitational forces

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Was known in 1911 A.D.

Was known in 1811 A.D.

Was known in 1711 A.D.

is still unknown

Was known in 1611 A.D.

For a given angle of projection, if the time of flight of a projectile is doubled, the horizontal range will increases to

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Four times

Thrice

Once

Twice

The direction of lines of force depends upon the direction of

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voltage

current

charges

none of these

A dirty carpet is to be cleaned by heating. This is an accordance with____ law of motion:

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First

Second

Third

None of these

If the values of instantaneous and average velocities are equal, the body is said to be moving with

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uniform acceleration

uniform speed

variable velocity

uniform velocity

Referring to the above figure, we can say that of all the elements, the most stable element is

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Phosphours

Iron

uranium

Lithium

Bismuth

The way through which electromagnetic radiations or photons interact with matter depends upon their:

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Wavelength

Frequency

Energy

Temperature

All of these

The substances whose resistance decreases with the increase in temperature these substances have coefficient of

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positive temperature

negative temperature

absolute temperature

zero temperature

A car travels first half distance between two places with a speed of 30 km/h and remaining half with a speed of 50 km/h. The average speed of the car is

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37.5 km/h

10 km/h

42 km/h

40 km/h

The tidal energy is produced due to rotation of Earth relative to:

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Moon

Sun

Oceans

Water

A 220 V, 50 Hz. A.C. source is connected to an inductance of 0.2 H and a resistance of 20 ohm in series. What is the current in the circuit?

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10 A

5 A

33.3 A

3.33 A

Light year is a unit of:

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Time

Distance

Velocity

Intensity of light

When angular acceleration is positive, the body rotates:

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Slower

Slowest

Faster

None of these

The number of input terminals of an op-amp is:

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One

Two

Three

Four

None of these

As the light shines on the metal surface, the electrons are ejected

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slowly

instantaneously

either of these

none of these

Balmer series lies in that region of electromagnetic wave spectrum which is called:

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Visible region

Invisible region

Infra-red region

ultraviolet region

None of these

The special theory of relativity is based on:

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Four postulates

Three postulates

Two postulates

One postulate

None of these

The phase determines the

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displacement

amplitude

frequency

state of motion of vibrating body

To and fro motion of a body is about its mean position is known as:

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Translatory motion

Vibratory motion

Rotatory motion

None of these

To sources are said to be coherent if they have:

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Same amplitude

Same wavelength

Definite phase relation with each other

None of them

Which of the following does not exhibit S.H.M?

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a plucked violin string

a mass attached to a spring

a train shunting between two terminals

a simple pendulum

Frequency of red color as compared to that of violet color is:

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Equal

Smaller

Greater

None of these

A ball is dropped from a height of 4.2 meters. To what height it will rise if there is no loss of KE after rebounding?

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4.2 m

8.4

12.6

None of these

The horizontal range of projectile, at a certain place, depends upon

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the mass of the projectile

velocity of projection

angle of projection

angle as well as velocity of projection

How many isotopes of helium are present?

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1

2

3

4

The most suitable material for permanent magnet is

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cobalt

iron

steel

alaminium

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