Question # 1

Thermos flask, is used to maintain:

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Heat

Temperature

Density

Pressure

Dull black surface are good ____________

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Absorber

Radiator

Conductor

None of these

Thermal conductivities of Lead

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23

30

35

85

During the hot summer day the vlaue of atomospheric pressure is:

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Increase

Decreases

Constant

None of these

__________ expands on heating?

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Matter

Plasma

Gas

Solid

The sum of kinetic energy and potential energy of molecules or atoms is called.

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Temperature

Internal energy

Kinetic energy

Potential energy

Work is done when force displace inits own _____________

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Way

Method

Direction

None

The value of g at a height one Earth's radius above the surface of the Earth is

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2 g

1/2 g

1/3 g

1/4 g

How many components are there of a solar heating system?

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2

3

4

5

Value of 'g' on surface of moon is:

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1.62 ms^-2

3.7 ms^-2

9.2 ms^-2

10 ms^-2

An increasing with decline in atmospheric pressure cause:

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Rainy condition

Pleasent condition

Windy condition

Intense condition

A converging lens becomes a magnifying glass when an object is placed:

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Outside of focal length

Inside the focal length

Equal of focal length

At double of focal length

Big unit of capacitance is:

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Farad

Volt

Watt

Coulomb

After how much time the echo must be heard?

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0.1 s

0.10 s

0.20 s

0.50 s

If there is divergence of leaves by touching a body with electroscope then the body is:

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Semi conductor

Neutral

charge body

Insulator

What is the power rating of a lamp connected to a 12 v source when it carries 2.5 A?

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4.8 W

14.5 W

30 W

60 W

The SI unit of electric field intensity is:

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NC-2

NC-1

Ns

Nm-1

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 distance between two consecutive troughs or crests is called:

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wavelength

Frequency

Time period

None of these

According to ohm’s law V= :

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I²R

IR²

IR

I/R

The rating of a fuse wire is always expressed in:

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ampere-hours

KWh

Volts

Amperes

Frequency of tuning fork depends upon its …………. of prongs:

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Weight

Speed

Mass

Distance

Half wavelength corresponds to

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0 ^o

90 ^o

180 ^o

360 ^o

In young's double slit experiment for the interference the central region will be

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Dark

Bright

Coloured

None of these

2 radian = ____

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2 m

4 m

57.3 m

114.6 m

If velocity time graph is parallel to time axis, then acceleration of moving body will be.

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Maximum

Positive

Zero

Negative

For maximum range the angle of projection must be

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30^o

45^o

60^o

90^o

The time period of an oscillating mass spring system is 10 second. If mass attached to spring id doubled then time period becomes.

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10 sec

20 sec

5 sec

None of these

Two tuning forks of frequencies 240 Hz and 243 Hz are sounded together, the number of beats per second is.

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Zero

2

3

4

__ will travel faster than other through an optical fibre.

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Ultraviolet light

Visible light

Infrared light

White light

Which of the following is not directed along the fixed axis of rotation.

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Angular displacement

Angular momentum

Centripetal acceleration

Angular acceleration

the locus of all pint in the same wave of vibration is called.

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Wave front

Diffraction

Interference

Polarization

The centre of Newton's fringe is dark due to.

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Destructive interference

Diffraction

Constructive interference

Polarization

At high frequency, the current through a capacitor is

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Small

Infinity

Zero

Large

The unit of work function is

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Electron volt

Ampere

Volt cell

Hz

The Balmer series is obtained when all the transition of electrons terminate on

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1^st orbit

2nd orbit

3rd orbit

4th orbit

In an LRC circiut, the capacitance is made one-fourth, when an resonance . Then what should be change in inductance, so that the circuit remain in resonance?

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4 times

1/4 times

8 times

2 times

In frequency modulation which factor changed.

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Amplitude of charge carriers

Frequency of charge carriers

Amplitude of signal

Frequency of signal

In glass, molecules are irregularly arranged so it is known as.

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Solid

Liquid

Solid liquid

Gas

By increasing the temperature of conductor, the flow rate of charges.

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Increase

Remains constant

Decreases

Changes exponentially

Balmer series lies in region of electromagnetic spectrum.

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Infrared

Visible

Ultraviolet

Fra infrared

In gas the charge carriers are:

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Electrons

Ions

Both a & b

None of above

The ratio of applies stress to volumetric strain is called:

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Young modulus

Shear modulus

Bulk modulus

Tensile modulus

A metal rod of 1 m is moving at a speed of 1 ms-1 in a direction making an angle 30^o with 0.5 T magnetic field . The emf produced is.

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0.25 N

2.5 N

0.25 V

2.5 V