Question # 1

Generally a temperature scale is established by

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one fixed point

two fixed point

three fixed point

four fixed point

A certain force gives an acceleration of 2 m/sec2 to a body if mass 5 kg. The same force would give a 29 kg object an acceleration of:

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0.5 m/sec2

5 m/sec2

1.5 m/sec2

9.8 m/sec2

The effect of applying a force on a moving body is to change

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its direction of motion only

its speed of motion only

both the direction and speed of motion

its inertia only

The rate at which the free electrons pass through any section of a metallic wire from right to left is:

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Greater than the speed at which they pass from left to right

Less than the speed at which they pass from left to right

The same speed at which they pass from left to right

Any of above

None of them

Carnot heat engine only used

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isothermal processes

adiabatic processes

both of them

none of them

Which one of the following waves belongs to electromagnetic spectrum

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Radio and TV waves

Radar waves

Micro waves

All of them

Which of the following types of force can do no work on the particle on which it acts

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Frictional force

Gravitational force

Electric force

Centripetal force

While describing the motion of a simple pendulum, the frictional effects are

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taken into account

completely ignored

partially ignored

none of them

Amorphous solids are also more like

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crystalline solids

gases

liquids

any one of them

The output voltage of half wave rectification is in the form of

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a smooth curve

a smooth wave

pulses

all of the above

A typical rocket ejects the burnt gases at speeds over

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400 ms^-1

40000m s^-1

40000 ms^-1

60000 ms^-1

Victor de-Brogile received the Nobel prize in physics in

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1925

1929

1932

1935

At a given instant, a photon moves in +x direction in a region where there magnetic field in -z direction. The magnetic force on the proton will be the:

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-y direction

+y direction

+z direction

-z direction

None of these

An inkjet printer uses in its operation:

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Neutrons only

Mesons only

Positrons and photons

An electric charge

None of these

If the length of second pendulum becomes four times then its time period will become

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Four time

Two times

Six times

Eight times

Which of the following substances has got positive temperature coefficient of resistance?

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Carbon

Germanium

Silicon

Aluminium

None of these

The device which can convert heat energy into electrical energy is called:

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Thermistor

Thermometer

Thermostat

Thermocouple

Both (C) and (D)

Bernoulli's equation is based upon law of conservation

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Mass

Momentum

Energy

None of these

Force is a:

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Scalar quantity

Base quantity

Derived quantity

None of these

A body starting from rest covers a distance of 0.45 Km and acquires a velocity of 300 Kmh^-1. its acceleration will be

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7.71 m s^-2

0.5m s^-2

0.15m s^-2

0.092m s^-2

The minimum charge on any object can not be less than

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1.6 x 10^-19C

3.2 x 10^-19C

1.0 C

4.8 x 10^-19C

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

A photon is considered to have

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Momentum

Energy

Wavelength

All of the above

In an A.C circuit with resistor only, the current and voltage have a phase angle of

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90°

0°

180°

none of these

Two samples A and B of a gas initially of the same temperature and pressure are compressed from a volume V to a volume V/2 such that A is compressed isothermally and B adiabatically. The final pressure

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A greater than than of B

A is equal to that of B

A is less than that of B

A is twice the pressure of B

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

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maximum frequency

minimum frequency

threshold frequency

all of these

A convex lens acts as diverging lens when the object is placed:

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Between F and 2F

At 2F

With focal length

Beyond 2F

The reactance of a coil when used in the domestic A.C. power supply (220 volts, 50 cycles per second) is 50 ohms. The inductance of the coil is nearly

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2.2 henry

1.6 henry

0.22 henry

0.16 henry

When the body is moves against the force of friction on a horizontal plane, the work done by the body is:

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Positive

Negative

Zero

None of these

Which of the following is not an example of intertial frame

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a body placed on the surface of earth

a body placed in a car moving with uniform velocity

a body placed in a car moving with same acceleration

none of these

A digital system deals with quantities or variables which have

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only one state

only two discrete states

three discrete states

four discrete states

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