Question # 1

Silicon is one of the mot commonly used:

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onductor

Dielectric

Insulator

Semiconduction

Both (B) and (C)

When the charged particle is projected at right angles to the field, then experienced by it will be:

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Maximum

Zero

qvB

Both (A) and (B)

Both (A) and (C)

The space around the earth in which its gravitational force acts on a body is called

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Electric Field

Gravitational field

Magnetic field

Conservative field

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

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Small

Greater

Equal

Sometimes

If a gymnast is sitting on a rotating stool with his arms outstretched, brings his arms towards the chest, then its angular velocity will:

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Increase

Decrease

Remains constant

None of these

The electric field lines start from:

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Positive charge

Negative charge

Either A and B

Neutron

An atom

The work performed on an object does not depend on

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Force applied

Angle at which force is inclined to the displacement

Initial velocity of the object

Displacement

While deriving the equation for pressure of a gas we consider the

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rotational motion of molecules

vibrational motion of molecules

linear motion of molecules

all of them

In an interference pattern of Young's double slit(YDS) experiment:

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Bright fringesare wider than dark fringes

Dark fringes are wider than bright fringes

Both dark and bright fringes are of equal width

Central fringes are wider than the outer fringes

The value of electrical constant of proportionality k is

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9 x 10⁹Nm²C^-2

9 x 10^-9Nm²C^-2

9 x 10¹⁰Nm²C²

9.85 x 10^-12N^-1C^-2

A rotating wheel accelerates up to the value of 0.75 rev/sec²after 2 seconds of its start. Its angular velocity becomes:

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9.42 rad/sec

2.6 rev/sec

1.5 rev/sec

Both A and C

It is possible to recognize a person by hearing his voice even if he is hidden behind a solid wall. This is due to the fact that his voice

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Has a definite pitch

Has a definite quality

Has a definite capacity

Can penetrate the wall

In the formula B= µ̻ nl, the symbol n denotes:

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Total number of turns of solenoid

Number of turns per unit length

Number of turns per unit volume

Numbers of turns per unit area

Number of moles

Dimensions of velocity are

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[L]

[T]

[LT^-1]

[LT^-2]

The direction of a vector in space requires:

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X-axis

X and Y-axes

XYZ axes

Y and Z-axes

An emf is set up in a conductor when it:

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Is kept in a magnetic field

Is kept in an electric field

Moves across a magnetic field

Both A and B

None of these

The passage of current is accompanied by a magnetic field in the surrounding space:

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Always accompanied

Sometimes accompanied

Never accompanied

Any of above

None of these

The SI unit of spring constant is identical with that of:

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Force

Surface tension

Pressure

Loudness

One radian is equal to:

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30.3°

45.3°

50.3°

57.3°

If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be

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Increasing by a factor of 2

Decreasing by a factor of 2

Decreasing by a factor of 4

Unchanged

The shortest distance between two points directed from its initial point to final point is called:

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Velocity

Displacement

Speed

Distance

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives to an effect called

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Diffraction

Interference

Polarization

Dispersion

A ball falls on the surface from 10 m height and rebounds to 2.5 m. if the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is

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2100 m/s²

1400 m/s²

700 m/s²

400 m/s²

From sand, we get a material used for construction of computer chips. That material is called:

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Germanium

Silicon

Copper

Lead

The instantaneous velocity of a body moving along a circle is directed

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along the radius

along the tangent

away from the circle

none of them

The alternative voltage of current is actually measured by:

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Its RMS value

Square root of its mean square value

Instantaneous value

Peak value

Both (A) and (B)

Which one of the following elasticizes is possessed by fluids:

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Young's elastic modulus (length)

Bulk elastic modulus (volume)

Modulus of rigidity (shape)

None of these

In an ideal gas, the molecules have:

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Kinetic energy only

Potential energy only

Both KE and PE

None of these

In full wave rectification, simultaneous action is that:

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Two diodes conduct and two do not.

One diode conduct and three do not.

Three diodes conduct and one does not.

All the four diodes conduct

None of these

A person starts his journey from a point 0, travels 4 Km SW, then 4 Km NW, and finally 4 Km north-east. At what distance is he now from point 0?

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0 Km

4 Km

8 Km

12 Km

The closed loop gain of the inverting amplifier is written as

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G = R₂/R₁

G = 1 + R₂/R₁

G = -R₂/R₁

G = 1 - R₂/R₁

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