Question # 1

A force of 200 N is making an angle of 30°. What is horizontal component?

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173.2 N

100 N

600 N

None of these

The motion of a body about an axis is called.

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Random motion

Vibratory motion

Rotatory motion

Circular motion

Bimetallic strip works on the principle of

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expansion of metals

contraction of metals

both (A) and (B)

unequal expansion of metals

Friction is due to

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Roughness

Shape

Smoothness

None

The tendency of doing work is called :

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Time

Energy

Force

Area

Latent heat of fusion is denoted by:

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H1

Hm

Hv

Hf

At a height of 30 km, atmospheric pressure is:

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101300 Pa

1000 Pa

10000 Pa

101325 Pa

A body jumps out of a moving bus. There is a danger for him to fall:

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Towards the moving bus

Away form the bus

In the direction of motion

opposite to the direction of motion

Convention is done by ____________

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Vibration of atoms

Actual movement of particles

Same as conduction

Nil

Room are heated using gas heaters by:

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Conduction only

Convection and radiation

Radiation only

Convection only

Atmospheric pressure is measured by an instrument called:

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Barometer

Altimeter

Meter rod

Hydrometer

The index of refraction depends on:

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The focal length

The speed of light

The image distance

The object distance

The index of refraction depends on:

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The focal length

The speed of light

the image distance

The object distance

Intensity level of the sound produced by mosquito buzzing is:

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70 dB

40 dB

10 dB

120 dB

1 Pico farad is equal to:

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10^-9F

10¹²F

10^-12F

10^-6F

Which among the following radiation has more penetrating power?

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A beta pareticle

A gamma particle

An alpha particle

None of these

Which component is output device of computer?

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CPU

C.D

Keyboard

Monitor

The unit of electrical energy is:

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Joule

Watt

Volt

Electron volt

Human skin, in dry conditions, has a resistance of:

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20,000 ohm

100,000 ohm

30,000 ohm

2000 ohm

The direction of induced e.m.f. in a circuit is in accordance with conservation of.

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Mass

Charge

Momentum

Energy

The filament of an electric bulb is made of:

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Nickel

Aluminium

Tungsten

Carbon

When light passes through a prism it deviates from its original path due to:

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Reflection

Diffraction

Interference

Refraction

First law of thermodynamics can be defined by the equation

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Force acting on the piston to move outward is.

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Compressive stoke

Power stoke

All stoke

Exhaust stoke

In vibrating string, the points where the amplitude is maximum are called.

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Nodes

Antinodes

Troughs

Crests

the wavelength of transverse wave travelling with a speed 'v' having frequency 'f' in equal to

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f/v

Vf

V/f

f/V2

Using a graded Index fibre, the time difference is reduced to about.

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1 ns per km

33 ns per 100 km

33 ns per km

1 ns per 100 km

Which one of the following force cannot do any work on the particle on which it acts.

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Fractional force

Gravitational force

Electrostatic force

Centripetal force

If the slope of a velocity time graph gradually decreases than body is said to be moving with

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Positive acceleration

Negative acceleration

Uniform velocity

None

When average velocity becomes equal to instantaneous than body is called moving with.

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Instantaneous acceleration

Constant acceleration

Constant velocity

Variable velocity

Total confined light is obtained by

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Total internal reflection

Refraction of light

Diffraction

Polarization

10 N and 20 N are acting on a body of mass 2 kg the minimum acceleration will be.

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10 ms-2

20 ms-2

60 ms-2

5 ms-2

the example of mechanical waves is

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Water waves

Infrared waves

Radio waves

Ultraviolet waves

Albert Einstein got noble prize for service in:

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Pair production

Annihilation of matter theory

Compton effect

Photoelectric effect

Electro magnetic waves emitted from radio antenna are.

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Stationary

Longitudinal

Transvers

Both a and b

The charge on Beta particle is

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+e

-e

-2e

None of these

In modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

The first laser was built by

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ArthursSchawalow

T.H.Maiman

Peter Sorokin

C.H.Townes

In order to measure potential difference voltmeter is always connected in.

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Series

Parallel

Both a and b

Neither in series nor in parallel

In a coil current change from 2 to 4 A in .05 s . If the average induced emf is 8 V then coefficient of self-inductance is:

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0.2 henry

0.1 henry

0.8 henry

0.04 henry

the number of terminals in a semiconductor diode are

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2

3

4

5

The charge number of Ba is.

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197

141

56

85

Current passing through the coil of galvanometer

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CO/BAN

CoN /BA

NAB/CO

AN/BCO

The work done is bringing a unit positive charge from infinity to that point in an electric field is called.

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Potential

Potential difference

Absolute potential

All of these