Question # 1

Electric field strength is defined as

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Work done on unit charge

Force exerted on unit charge

Distance covered by unit charge

Power exerted by unit charge

None of these

An eV is unit of:

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Potential

Energy

Work

Power

Both (B) and(C)

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

Amplitude in SHM is equivalent to ______ in circular motion

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Diameter

Radius

Circumference

None of these

The decrease in velocity per unit time is called:

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Variable Acceleration

Average Acceleration

Retardation

None of these

If speed of electron is 5 x 10⁵m/s. How long does it take one electron to transverse 1 m?

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1 x 10⁶

2 x 10⁶

2 x 10⁵

1 x 10⁵

A the top of the trajectory of a projectile, the directions of its velocity and acceleration are

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Perpendicular to each other

Parallel to each other

Inclined to each other at an angle of 45°

Anitparallel to each other

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

Swimming becomes possible because of______law of motion:

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First

Second

Third

None of these

If the absolute uncertainty of an instrument is 0.0a1 cm, then its least count will be :

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0.005 cm

0.01 cm

0.02 cm

0.001 cm

Resolving power in mth order diffraction for grating is given by:

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R = N/m

R = m/N

R = N x m

None of these

Max Planck received the Nobel Prize for his discovery of energy quants in:

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1718 AD

1918 AH

1818 AD

1918 AD

None of these

The behaviour of gases is well accounted by the kinetic theory based on

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microscopic approach

macroscopic approach

both of them

none of them

The electric intensity outside the two oppositely charged parallel metal plates is

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Maximum

Minimum

Zero

Infinite

When a constant potential difference is applied across the conductor, the drift velocity of electrons:

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Increases

Decreases

Remains the constant

Either of these

None of these

A weakly damped system has fairly

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sharp resonance curve

flat resonance curve

both of them

none of them

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

If we plot graph between potential difference (V) and current (I) obeying ohm's law, it will give us

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parabola

straight line

hyper bola

ellipse

Bernoulli's equation is important in the field of

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Electrical circuit

Magnetism

Photoelectric effect

Flow of fluids

Blood pressure is measured in torr. Which of the following units could belong to torr?

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N m^-1

N m^-2

N m

N^-1m^-2

When the atomic particle are moving with velocities approaching that of light:

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Newton's laws become valid

Relativistic effects become prominent

Botha(A) and (B) are valid

Neither (A)nor (B)

There mass becomes zero.

In an N-type silicon, which of the following statement is true

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Electrons are majority carriers and trivalent atoms are the dopants

Electrons are minority carriers and pentavalent atoms are the dopants

Holes are minority carriers and pentavalent atoms are the dopants

Holes are majority carriers and trivalent atoms are the dopants

The number of countries who manage the largest satellite system is:

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3

24

126

200

Electric intensity at a place due to a charged conductor is a

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Scalar quantity

Vector quantity

Semi vector and semi scalar

Dimensionless quantity

Both A and D are true

Amplitude in SHM is equivalent to ______ in circular motion:

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Diameter

Radius

Circumference

None of these

A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is

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Two

1/2

Zero

3/2

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

Depletion region contains:

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Protons

Positive ions

Negative ions

Both (B) and (C)

Both (A) and (C)

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

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

In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:

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Short wavelength

Large wavelength

Very large wavelenth

Low frequency

Both (B) and (C)

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