Question # 1

A stationary sound wave has frequency 165 Hz (speed of sound in air = 330 m/s) then distance between two consecutive nodes is

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2 m

1 m

0.5 m

4 m

How many isotopes of helium are present?

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1

2

3

4

The open loop gain of OP-AMP is of the order of

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10²

10³

10⁴

10⁵

A swing has

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one natural frequency

two natural frequencies

three natural frequencies

four natural frequencies

Op-amp has been discussed as comparator of:

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Distances

Voltages

Velocities

Magnetic fields

Both (A) and (C)

The direction of vector in space is specified by:

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One angle

Two angles

Three angles

None of these

Avo-meter is used of measure the

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current, voltage

voltage, resistance

resistance, current

current, voltage and resistance

Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called

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deuteron

deterium

protium

tritium

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

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

Work done is independent of path followed in _______

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Gravitational field

Magnetic field

Electric field

All of these

When a ray of light goes from a denser medium into a rare medium

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The wavelength of light is decreased

The frequency of light increased

The speed of light is increased

The light undergoes a phase change of π

If the water falls from a dam into a turbine wheel 19.6 m below,then the velocity of water at the turbine is

(Take g = 9.8 m/s²)

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9.8 m/s

19.6 m/s

39.2 m/s

98.0 m/s

For maximum linear distance of travel, a projectile must be fired at an angle of

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0°

45°

90°

60°

The word fluid means

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To rise

To fall

To flow

To oppose

The mass distribution of a rigid body is

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Uniform

Not uniform

Both

None of these

A 120 m long train is moving in a direction with speed 20 m/s.A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time

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6 s

36 s

38 s

None of these

A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of particle.the motion of the particle takes place in a horizontal plane.It follows

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Linear momentum is constant

Velocity is constant

It moves in a circular path

None of these

Solids having partially field conduction bands are

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Insulator

Semiconductor

Super conductor

Semi conductor

Rest mass energy of electron is:

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1.02 MeV

0.51 MeV

931 MeV

200 MeV

The quantity of motion of the body is called

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Force

Acceleration

Momentum

None of these

A couple produces

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Purely linear motion

Purely rotational motion

Linear and rotational motion

No motion

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