Question # 1

What happens to the thermal conductivity of a wall if its thickness is doubled?

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Become double

Remain the same

Become half

Become one fourth

Moon is nearly _________ km away from earth.

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6 x 10²⁴

380000

199.62 km

30000

Atmospheric pressure is measured by an instrument called:

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Barometer

Altimeter

Meter rod

Hydrometer

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

If an object is moving with a uniform changing speed then speed time graph .

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Variable

Parallel to time axis

Straight line

If the acceleration is 10 m/s2 and mass 10kg:

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F = 99N

F = 100 Kg

F = 100 m/s2

F =100 N

The value of 'g' on the surface of Mars:

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3.73 ms^-2

1.62 ms^-2

Zero

Constant

The velocity and acceleration of the body moving with uniform speed in a circular path will be:

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In same direction

In opposite direction

Mutually perpendicular

Equal

Clockwise torque is taken:

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Positive

Negative

Neutral

Nil

A material of thermometer should has:

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Visible

High freezing point

Low melting point

All of these

What gas behaves as glass or polythene to radiation:

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Nitrogen

Hydrogen

Carbon di oxide

Methane

LDR can act as:

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Diode

Switch

Transistor

Rectifier

The unit of spring constant is:

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m

kg

Nm²

Nm^-1

Totally reflecting prism turns the incident ray at an angle of:

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90^o

60^o

75^o

45^o

For observing how fast plants are absorbing phosphate fertilizer we use.

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I.131

Ph -32

Co-60

Ar-40

To protect the gold leaves of electroscope from the external electric disturbances, the aluminum foil is grounded by a thin wire, which is made up of:

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Aluminum

Silver

Copper

Brass

The symbol of alpha particles is:

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4AHe

42He

0-1B

00Y

Power of lens is:

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q/p

1/q

1/p

1/f

The commercial unit of electrical energy is:

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Joule

Watt

Kilowatt hour

Electron volt

The distance between two consecutive compressions or rarefactions in longitudinal waves is called:

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Amplitude

Wavelength

Half wavelength

1/4 wavelength

for which of following ampere second could be the unit:

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energy

current

charge

power

In simple Harmonic motion, the acceleration of the body is _____ proportional to the displacement.

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Inversely

Directly

Equally

None of these

the work done in isochoric process is.

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Constant

Variable

Zero

Depend upon condition

The accepted value for speed of light in vacuum

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2.99 x 10⁸m - sec^-1

2.99 x 10⁶m - sec^-1

2.99 x 10⁸km - sec^-1

2.99 x 10⁸m - h^-1

Kilo watt hour is the unit of

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Power

Energy

Force

Torque

Transformation of heat other forms of energy is discussed in

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Thermal physics

Thermodynamics

Atomic physics

Nuclear physics

The direction of vector in space is specified by

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1- angle

2- angle

3- angle

4 - angle

Which one of the following can not be polarized.

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Ultra violet rays

Radio waves

T.V. Waves

Sound waves

Stoke's law holds for bodies having.

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Spherical shape

Oblong shape

Rectangular shape

All shapes

An immediate source of energy for our body is:

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mango

Glucose

mushroom

meat

The law of conservation of mass gives.

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Beronoulli's

Venturi relation

Torricelli's theorem

Equation of continuity

For normal adjustment what is the length of astronomical telescope if focal lengths of astronomical telescope if focal lengths of objective and eye piece are 100 cm 20 cm respectively.

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10 cm

20 cm

5 cm

120 cm

The weight of the body at the centre of earth is

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Maximum

Minimum

Zero

Infinite

When a nucleus emits an alpha particle, its atomic mass decreases by

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1

2

3

4

One use of a single p-n junction semiconductor in an electrical circuit is a

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Rectifier

Transistor

Battery

Diode

Electric flux is a

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Vector quantity

Scalar quantity

Both (a) and (b)

None of above

Selenium is

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Insulator is dark

Insulator in light

Conductor in dark

Semi conductor in dark

A light emitting diode emits light only when

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Reverse biased

Forward biased

Unbiased

None of these

The potential difference between the head and tail of an electrical to

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600 Volt

700 Volt

800 Volt

900 Volt

If the ionization energy of hydrogen atom is 13.6 eV, its ionization potential will be

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136.0 volt

3.0 volt

13.6 volt

None of these

Balmer series lies in region of electromagnetic spectrum.

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Infrared

Visible

Ultraviolet

Fra infrared

The binding energy for_________ is maximum.

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Copper

Glass

Iron

Aluminum

Which pair belongs to hadrons.

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Protons and Neutrons

Neutrons and electrons

Photons and electrons

positrons and electrons

When a wire is stretched and its radius becomes r/2, then its resistance will be

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16 R

4 R

2R

0