Question # 1

The interior of a hollow charged metal sphere is a region which:

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Contain some magnitude of electric field

Is full of electric field lines

Is field-free region

Either (A) or (B)

None of these

Which of the following statements for an object in equilibrium is not true?

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The object must be at rest

The object can be at rest

The object is moving at constant speed

The acceleration of the object is zero

When heat is added into the system then change in entropy is

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negative

positive

zero

any one of them

If the external driving force is periodic with a period compareable to the natural period of the oscillator, then we get

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diffraction

beat

interference

resonance

The mass of the object is a quantities measure of its

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speed

velocity

acceleration

inertia

Amplitude in SHM is equivalent to ______ in circular motion

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Diameter

Radius

Circumference

None of these

If F=0.04 N and X=4 cm then K=

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1 Nm^-1

2 Nm^-1

3 Nm^-1

4 Nm^-1

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

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The upper half of the image is cut off

The brightness of the image is reduced

The brightness of the image is increased

No effect at all

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

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2 : 1

4 : 1

1 : 4

3 : 4

The input resistance of the OP-AMP is the resistance between the

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(-) input and output

(+) input and output

(-) and (+) inputs

between any inputs

An eV is unit of:

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Potential

Energy

Work

Power

Both (B) and(C)

The dimensional formula of gravitational constant G is:

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MLT^-2

ML³T^-2

M^-1L³T^-2

M^-1LT^-2

The equations of angular motion only hold true when the axis of rotation is

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Not fixed

Fixed

Fixed in some equations

None of these

Fractional error in a measured quantity is determined by

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Measured value / Absolute error

Absolute error / Measured value

Measured value + Absolute error

Measured value - Absolute error

How many phone calls can be carried by single mode step index fibre

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25000

96000

14000

21000

How is the interference pattern in Young's double slit experiment affected if the sodium light is replaced by red light of the same intensity

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The fringes will vanish

The fringes will become brighter

The fringes will increase

The fringes will decrease

On heating, it becomes a very viscous liquid at almost

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500 C^o

800 C^o

900 C^o

1000 C^o

In multi-mode step index optical fibre, that layer is called cladding which has

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higher refractive index

lower refractive index

both of them

none of them

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

An electron and a proton are projected at right angles to a uniform magnetic field with

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the electron trajectory will be less curved than proton’s trajectory

the electron trajectory will be more curved than proton’s trajectory

) both trajectories will be equally curved

) both particles continue to move along a straight lins

The linear velocity in a circle is called

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Linear velocity

Angular velocity

Tangential velocity

None of these

A certain engine coverts 20% of available heat energy into work. Then its efficiency will be:

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20%

80%

50%

None of these

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