Question # 1

In an adiabatic expansion, the temperature of the gas

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increases

becomes zero

decreases

decreases rapidly

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

Sound waves in air always

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Longitudinal

Transverse

Stationary

Electromagnetic

A line which represents the direction of travel of a wave is known as:

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Spherical Wavefront

Locus

Ray

Either B or C

The pointer of a magnetic compass:

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Is affected only by permanent magnets

Align itself parallel to the applied magnetic field

Vibrates in the magnetic field of the current

Aligns itself perpendicular to the magnetic field

Both (C) and (D)

An inkjet printer uses in its operation:

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Neutrons only

Mesons only

Positrons and photons

An electric charge

None of these

A (100 W , 200 W) bulb is connected to a 160 V power supply. The power consumption would be

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64 W

80 W

100 W

125 W

Photoelectrons are emitted when ultraviolet light falls on:

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Casium

Silver

Potassium

Any of these

None of these

A uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be

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2 R

R

R/2

R/4

SI unit of wave length is:

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Kilometer

Metre

Centimetre

Hertz

When heat is added into the system then change in entropy is

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negative

positive

zero

any one of them

In order to have a constant current through wire, the potential difference across its end should:

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Be zero

Be maintained constant

Goes on increasing

Go on decreasing

Both (A) and (B)

The magnitude of chemical Effects depends upon:

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Nature of liquid

Quantity of Electricity passed through the liquid

Color of the liquid

Both (A) and (C)

Both (A) and (B)

The special theory of relativity is based on the

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one postulate

two postulates

three postulates

four postulates

Which of the following type 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

If the length of a simple pendulum is 0.25 m its time period would be

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1.0 s

2.0 s

3.0 s

4.0 s

A 2 kg block is held 1 m above floor for 50 seconds. The work done is:

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Zero

10.2 J

100 J

980 J

A current carrying conductor sets up its own:

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Electric field

Nuclear field

Magnetic field

Both (A) and (C)

All of these

A 100 kg car is moving at a speed of 10 m/sec and comes to rest after covering a distance of 50 m. the amount of work done against friction is:

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+5 x 10¹J

+5 x 10²J

+5 x 10³J

+5 x 10⁴J

Which waves are used in sonography?

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Microwaves

Infra red waved

Sound waves

Ultrasonic waves

X-ray are also known as

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Roentgen rays

Maxwell rays

Plank range

Einstein rays

Find the total displacement of a body in 8 seconds starting from rest with an acceleration of 20 cm/s²

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0.064 m

640 cm

64 cm

64 m

A particle is moving along a circular path with uniform speed. Its projection will execute ___along the _____ of the circle:

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Circular motion, circumference

Vibratory, chord

SHM, diameter

SHM, circumference

If we draw a graph between d(along x-axis) and F (along y-axis) and get a straight line horizontal to x-axis then area under this straight line represents:

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Power

Work

Pressure

None of these

X-rays produced in a tube operating at 10⁵V. The speed of X-rays produced is

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3 x 10⁸m/s

3.1 x 10⁸m/s

2.8 x 10⁸m/s

1.88 x 10⁸m/s

Magnetic flux passing through the an element of are A placed perpendicular to a uniform magnetic field Bis:

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Maximum

Minimum

Zero

Very small

None of these

A car battery has e.m.f 12 volt and internal resistance 5 x 10^-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

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5 volt

3 volt

15 volt

9 volt

If the mass of the simple pendulum becomes double, its time period

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increase

decreases

remains constant

none of them

In the phenomenon of hysteresis

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magnetism leads the magnetising current

magnetism lags behind the magnetising current

meganetism goes along the magnetising current

none of them

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

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Newton

Joule

Joule-Sec

Joule-s^-1

Watt

The unit of work function is:

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Joule

Electron volt

That of threshold frequency

Both (A) and (B)

None of these

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