Question # 1

A black dull surface is a good ________ of heat:

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Emitter

Absorber

Reflector

Both A and B

Perpendicular / hypotenuse is equal to:

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Cosθ

Tanθ

Cosecθ

Sinθ

The unit of momentum is :

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kgms^-1

kgms^-2

m sec

None

If the velocity of moving body in circle is doubled, then its centripetal force is

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Double

Half

Four times

Remain

If the force of 25 N is acting along the string to balance the weight then tension in string is

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25 N

50 N

Zero

None

According to Archimedes, up thrust is equal to :

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Weight of displaced liquid

Volume of displaced liquid

Mass of displaced liquid

None of these

Clinical thermometer is used by:

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Astronomers

Doctors

Scientist

Chemists

The symbol of sigma is :

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Σ

m

=

$

Rate of change of momentum is equal to:

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Mass

Torque

Weight

Force

A body is in neutral equilibrium when its centre of gravity:

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Is at its highest position

Is at the lowest position

Keep its height if displaced

Is situated at its bottom

The rate of doing work is called :

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Power

Work

Efficiency

None of above

In a convex mirror the size of the image:

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Is smaller than the size of the object

Is greater than the size of the object

Depends upon the position of the object

Is equal to the size of the object

A device which has two way communication is:

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Television

Radio

Hard disk

Mobile phone.

Transformer which increase voltage is called.

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Step-up transformer

Step down transformer

D.C.Moter

A.C.genrator

Which is the most suitable means of reliable continuous communication between an orbiting satellite and Earth?

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Microwaves

Radio waves

Sound wave

any light waves

Which of the following quantities is not change during refraction of light:

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Its direction

Its speed

Its frequency

Its wavelength

The frequency of silent whistle is:

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20,000 Hz – 25000Hz

2000 Hz – 2500Hz

200 KHz – 2000 Hz

25000 KHz

Resistance of conductor is directly proportional to:

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Length

Pressure

Area

All of these

The output of a NAND gate is 0 when

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Both of its inputs are 0

Both of its inputs are 1

any of its inputs is 0

any of its inputs is 1

Which type of image is produced by the converging lens of human eye if it views a distant object:

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Real, erect, same size

Real, inverted, diminished

Virtual, erect, diminished

Virtual, inverted, magnified

The logical operation performed by this gate is:

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AND

NOR

NAND

OR

The shape of magnetic lines of force in case of a straight current carrying conductor is:

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Eliptical

Trangular

Rectangular

Circular

A bullet shot straight up, return to its starting point in 10 sec. Its initial speed was

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9.8 ms-1

24.5 ms-1

49 ms-1

98 ms-1

Speed of sound in aluminum at 20 ^oC is.

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3600 m/s

5100 m/s

5130 m/s

3500 m/s

The dimensional of potential energy per unit volume are same as that of.

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Work

Pressure

Speed

Density

The error in speed of sound calculated by Newton at STP is about.

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0 %

14 %

15 %

16 %

Moment of inertia is measure din

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Kg m2

Kg m-2

Rad s-1

Joule second

The state of human blood flow can be found by using.

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Newton's formula of speed of sound

Interference of sound

Phenomena of beats

Doppler's effect of sound

A finite volume of gas consists of

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Small no. of molecules

Large no. of molecule

Average no. of molecule

None of these

Pascal is the unit of

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Pressure

Force

Tension

Weight

The amount of inertia of 10 kg hoop about the axis of rotation perpendicular to its plane having radius 5 m is

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50 kgm2

100 K gm2

150 K gm2

250 K gm2

A ray of light shows the direction of propagation of light It is line which is.

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Normal to the wave front

Parallax to the wave front

Opposite to the wave front

Equal to the wave front

An oscillating mass-spring system produces

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Sound waves

Electromagnetic waves

Light waves

Periodic waves

Recentaly a complex crystalline structure known as yttrium barium copper oxide (Yba₂Cu₃O₃) have reported to become super conductor at

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163 K

169 K

200 K

100 K

A block body is an ideal:

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Absorber

Radiator

Both a & b

None of above

There are different crystal systems. The number of these crystal system is.

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3

4

5

7

The X-rays diffraction with crystal was first studied by

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W.H Bragg

W.L. Bragg

Michelson

None of these

The numerical value of Compton wavelength is equal to

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3.43 x 10^-12 m

1.43 x 10^-12m

2.43 x 10^-12m

0.43 x 10^-12m

Albert Einstein got noble prize for service in:

Choose an answer

Pair production

Annihilation of matter theory

Compton effect

Photoelectric effect

NIBA =

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cθ

θ/c

c²θ

c²/θ

For Holography we use

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X ray

Laser

gama rays

Beta rays

After curie temperature.

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Ferromagnetic

Paramagnetic

Magnetic

Diamagnetic

The value of maximum output power is?

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E/4R

E²/4R

E/4R²

Non of above

Unit of Stephen's constant is

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W m K^-2

W m^-2 K^-4

W m K^-4

None