Question # 1

In summers the railways bends due to:

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Expansion

Contraction

Both

None

Water freezes at .

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0^o F

32 ^oF

-273 K

0 K

In thermo flask radiation is stopped by using :

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Green color

Transparent

Silver color

Nil

2nd law of motion is stated as:

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F=m/a

F=ma

F=a/m

F=ma²

A body is said to be in __________ equilibrium if after a slight tilt return to its previous position:

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Stable

Unstable

Neutral

None

Light from the sun contain thermal radiation of:

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Long wavelength

Short wavelength

Ultra violet rays

Visible light

PQ & RS are 2 parallel forces moving in same direction than they are called ............... forces.

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Like parallel

Unlike

Parallel

Nil

The Earth is surrounded by a cover of air called

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Atmosphere

Solid

Environment

Surroundings

Standards, of physical quantities were established in .

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1910

1020

1950

1960

In gases, heat is mainly transferred by

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Molecular collision

Conduction

Convection

Radiation

Which of the following material lowers friction when pushed between metal plates:

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Water

Fine marble poder

Air

Oil

For normal person audible frequency range for sound wave lies between.

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10 Hz and 10KHz

20 Hz and 20KHz

25 Hz and 25KHz

30 Hz and 30KHz

The sound level of rustling of leave is:

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1 dB

20 dB

30 dB

10 dB

AND operation is represented by:

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Dot (.)

Addition (+)

Division (÷)

Minus (-)

Diffraction of wave can be observed clearly only when the size of slit or obstacle is nearly ………. To the wavelength of the wave:

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Two times

Equal

Four times

Half

Mice can hear frequencies upto:

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100, 000 Hz

25.000 Hz

120,000 Hz

1,000 Hz

The distance of spherical mirror is called:

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Curvature

Aperture

Sphere

a,b

High pitch means:

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High wavelength

High frequency

High time period

High energy

The value of K in SI unit is:

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9X10²⁰ Nm²C²

8X10⁹Nm²C²

9X10⁹Nm²C²

10X10^-9 Nm²C^-2

1.6x10^-19 J= :

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1F

1N

1eV

The value of acceleration is simple harmonic motion at mean position is:

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Maximum

Zero

10 N

Both a and b

The ratio of image height to object height is called:

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Linear magnification

Power

Refraction

Radius of curative

The trajectory of a projectile is.

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Circle

Parabola

Hyperbola

Straight line

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

The Carnot cycle can be shown by which graph

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P - T graph

P - V Graph

V- T graph

PV -T graph

10 waves pass through a point in 2 seconds with speed 10 ms-1 the frequency of wave will be

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1 Hz

2 Hz

5 Hz

10 Hz

In matter, the Atoms are in a state of never ending

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Motion

Rest

Change

State of decline

The ratio of size of image and size of object is

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Focal length

Magnification

Resolving power

Principle focus

When two waves of same frequency travel in opposite direction, the phenomenon will be

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Diffraction

Stationary waves

Polarization

Interference

The resultant of two forces 3N and 4 N acting at right angle to each other is.

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5 N

6 N

1 N

7 N

Fringe spacing is inversely proportional to.

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Wave length

Slit separation

Distance between the slit and screen

Frequency of light

Reapters are placed in new system at distance of.

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30 km

50 km

80 km

100 km

An ideal reversible heat engine has

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100% efficiency

Highest efficiency

80%

90%

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

Dielectric constant _εr for air is:

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1

1.006

1.0002

1.0006

Magnetism is related to:

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Stationary charges

Moving charges

Stationary & Movingcharges

Law of motion

106 electrons are moving through a wire per second the current developed is:

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1.6 x 10-19 A

1 A

1.6 x 10-13A

106 A

Flux through any closed surface is:

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1/ε²_∘ times the total charge enclosed in it

ε²_∘ time the total charge enclosed in it

1/ε_∘ ties the total charge enclosed in ti

ε_∘ time the total charge enclosed in it

A semiconductor in its extremely pure form is known as:

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Intrinsic

Extrinsic

Both a and b

None of above

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

Compton effect proves.

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Wave nature of radiation

Wave nature of particle

Dual nature of particle

Particle nature of radiations

The special theory of relativity based on.

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One postulate

Two postulates

Three postulates

Four postulates

Energy stored in an inductor is:

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1/2L²I

1/2L²/I

_1/2LI²

1/2LI

The electric flux through closed surface depends upon

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Charge

Medium

Geometry

Charge and Medium