Question # 1

The magnitude of induced emf depends upon the:

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Rate of decrease of magnetic field

Rate of change of magnetic field

Rate of increase of magnetic flux

Constancy of magnetic field

None of these

The law of conservation of energy gives us

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equation of continuity

Bernoulli's theorem

both of them

none of them

A spring of constant k = 0.4 N m^-1is to be extended through 10 cm at a place where g = 10 m sec^-2. The mass to be suspended should be:

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4 gms

0.4 gm

40 gms

None of these

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

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100 ev

10⁶e v

10³e v

1.0 e v

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

Truth table of logic function:

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Summarizes its output values

Tabulates all its input conditions only

Display all its input/output possibilites

Is not based on logic algebra

None of these

If the object is placed at 12 cm distance from a convex lens of focal length 6 cm, then we get an image of ____ as that of object:

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Double the size

Same size

Half the size

None of these

When a force of 0.5 N displaces a body through a distance of 2m in the direction of force, the work done is

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0.5 J

2 J

0.25 J

1 J

According to Stoke's law, drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

A gas is compressed adiabatically till its temperature is double. The ratio of its final volume to initial volume will be

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1/2

More than 1/2

Less than 1/2

Between 1 and 2

A heat engine is that which converts

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mechanical energy into thermal energy

thermal energy into mechanical energy

K.E into potential energy

heat energy into light energy

A galvanometer in which the coil comes to rest quickly after the current passed through it, or the current stopped form flowing through it, is called

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dead beat galvanometer

stable galvanometer

shunt galvanometer

sensitive galvanomter

Angular momentum

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Scalar

Axial vector

Polar vector

At 45° angle

The earth's potential is taken as

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Negative

Positive

Zero

Infinite

The idea of quantization of energy was proposed by:

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Einstein

Max.Planck

Maxwell

Bohr

Rutherford

The maximum drag force on a falling sphere is 9.8 N, it weight is

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1 N

9.8 N

4.9 N

Cannot be calculated

When certain nucleus emits aβ-particles, is mass number:

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Remain same

Increases by one

Decreases by one

Decreases by four

None of these

When the waveform of one voltage is increasing and that of second is decreasing and vice versa, then phase difference between these voltage is

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90°

75°

0°

180°

An important part of photocopier is:

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Toner cartridge

Deflection plates

Charging electrode

Print head

None of these

Light year is a unit of

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Time

Distance

Velocity

Intensity of light

Acceleration of a body at any particular instant during its motion is known as

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average acceleration

uniform acceleration

instantaneous acceleration

all of them

At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes:

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Double

Remains constant

Half

None of these

An airplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically above a point A on the ground, a bomb is released from it. The bomb strikes the ground, at point B. The distance AB is

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1200 m

0.33 km

3.33 km

33 km

Which of the following four statements is false?

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A body can have zero velocity and still be accelerated

A body can have a constant velocity and still have a varying speed

A body can have a constant speed and still have a varying velocity

The direction of the velocity of a body can change when its acceleration is constant

The work done by a force keeping an object in circular motion with constant speed is:

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Zero J.

0.1 J

1 J

0.01 J

Which quantity has different dimension?

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Tension

Work

Energy

Torque

In case of metallic conductors, the charge carriers are

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Protons

Electrons

Antiprotons

Positrons

Both A and B

A train cover 90 km in half an hour. the time taken by it to travel 15 km will be:

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20 minutes

48 minutes

10 minutes

5 minutes

The useful unit of the angular displacement in SI unit is:

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Degree

Revolution

Radian

Metre

The SI unit of viscosity is

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kg m^-1s^-1

kg ms^-1

kg m^-1s^-2

kg m^-1s

If the velocity time graph is a straight line parallel to the time-axis, then it means:

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The body is moving with uniform velocity

The body is moving with uniform acceleration

The body is at rest

None of these

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