Question # 1

Turning effect of a force is called:

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Torque

Moment

Couple

Torque and momentum

On heating Air become:

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Heavier

Lighter

Remain same

None of these

At a height of 30 km, atmospheric pressure is:

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101300 Pa

1000 Pa

10000 Pa

101325 Pa

If the direction of motion of the force is perpendicular to the direction of motion of the body, then work done will be

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Maximum

Minimum

Zero

None of these

Water freezes at .

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0^o F

32 ^oF

-273 K

0 K

The smallest division taht can be taken by a meter rule is.

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1 cm

1 mm

1 dm

1 km

The radiation from sun is:

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Alpha

Gamma

Radio

Ultraviolet

That force which produces an acceleration of one metre per second per second in a body of one kilogram mass is called

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1 joule

1 newton

1 watt

1 ampere

The value of sin θ at an angle of 60o is

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0.5

0

0.707

0.866

Mercury is used as thermometric material because it has

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Uniform thermal expansion

Low freezing point

Small heat capacity

All the above properties

Work done is maximum when angle between force and displacement is:

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45°

0°

60°

90°

The brain of any computer system is:

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CUP

Monitor

Memory

C.U

If the mass of a spring mass system is doubled, its time period becomes:

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√2 T

T/2

√T/2

T/√2

For a normal person audible frequency range for sound wave lies between:

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10 Hz and 10kHz

20Hz and 20 kHz

25 Hz and 25 kHz

30Hz and 30 kHz

If focal length of a lens is 1m, then its power will be:

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1 D

0.5 D

1.5 D

1 D

A data storage device is.

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Printer

Hard disk

Monitor

CPU

The speed of sound in air is kmh^-1

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1243

1244

1245

1246

The critical angle for a beam of light passing from water into air is 48.8 degrees. This mean that all light rays with an angle of incidence greater than this angle will be:

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Absorbed

Totally reflected

Partially reflected and partially transmitted

Totally transmitted

When a heavy nucleus splits into, lighter nuclei, the process would .

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Release nuclear energy

Absorb nuclear energy

Release chemical energy

Absorb chemical energy

SI unit of capacitance is:

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Joule

Volt

Watt

Farad

The example of magnetic disk is:

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Compact disk

Floppy disk

Audio cassette

Video cassette

The S.I unit of intensity of sound is:

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Wm

Wm2

Wm-2

Wm-1

The collision between the gas molecules is

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Elastic

Inelastic

Both a and b

None of these

A ball is thrown up with 20 ms-1 at an angle of 60 ^owith x-axis , the velocity of the ball at the top position is.

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0 ms-1

10 ms-1

20 ms-1

16 ms-1

The efficiency of heat engine whose sink is at 17 ^oC and source at 200 ^oC is.

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38%

63%

80%

90%

Increase in the velocity of sound in air for 1 ^oC rise in temperature is.

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61 ms-1

0.61 ms-1

161 ms-1

261 ms-1

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 is a conservative force

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Elastic spring force

Air resistance

Frictional force

Tension in the spring

Watt -m2 is the unit of

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Energy

Intensity

Power

Work

Opted unit to measure blood pressure is.

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N/m2

Pascal

mm of Hg

N.m2

The dimensions of work are.

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[MLT-1]

[MLT-2]

[ML2T-2]

[MLT]

In case of planets centripetal force is provided by

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Coulomb's force

Electrostatic force

Gravitational force

Magnetic force

Work is a

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Scalar quantity

Vector quantity

Basic quantity

None of these

The maximum kinetic energy of emitted photo electrons depends upon.

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The intensity of incident light

Frequency of the incident light

Metal surface

Both frequency of incident light and metal surface.

A device which converts low voltage or current to high voltage or current is called.

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Transformer

AC generator

Amplifier

Rectifier

The unit of impedance is.

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Henry

Hertz

Ampere

Ohm

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, Then

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The charge in the plates reduces and potencial difference increase

Potencial difference between the plates increase, stored energy decreases and charge remains the same

Potencial difference between the plates decreases, stored energy decreases and charge remains unchanged

None of them

The current through a resistance of 100 Ohm when connecting across a source of 220 V is.

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22000 A

22 A

2.2 A

0.45 A

The early Greeks believed that matter waves was

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Discrete

Continuous

Both continuous and discrete

All of above

The physical quantity related to photon, that does not change in Compton scattering is.

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Energy

Speed

Frequency

Wavelength

An electron in H -atom is excited from ground state n=4 , How many spectral lines are possible in this case.

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6

5

4

3

NIBA =

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cθ

θ/c

c²θ

c²/θ

Cosmic rays consist of

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Protons

High energy photons

Positron

All of above

The energy of 4th Orbit in hydrogen atom is.

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-2.51 eV

-3.50 eV

-13.60 eV

-0.85 eV