Question # 1

Those objects that conduct electricity are:

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Conductors

Insulators

Semi conductOrs

None of these

Which property can be determine by ARchimedes principle:

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Vapour pressure

Density

Compressibility

Elasticity

A body jumps out of a moving bus. There is a danger for him to fall:

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Towards the moving bus

Away form the bus

In the direction of motion

opposite to the direction of motion

In Einstein's mass-energy equation c means speed of light. Its value is:

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3 x 10^-8 ms^-1

3 x 10⁸ms^-1

3 x 10⁹ms^-1

3 x 10¹⁸ms^-1

Sliding friction can be changed into rolling friction by using:

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Ball bearing

Roller bearing

Both a and b

None of these

Most of the matter that fills the universe is in state:

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Solid

Plasma

Liquid

Gas

Which types of friction is minimum?

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Sliding

Limiting

Rolling

None

____________ from sun are major source of energy on earth.

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Light

Radiation

Both a & b

None of these

The devise used to measure the atmosphere pressure is:

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Rain gauge

Vacuum cleaner

Screw gauge

Barometer

Which process produced cooling effect?

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boiling

freezing

condensation

evaporation

Transfer of heat between two bodies which are at same temperature is:

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Maximum

Minimium

Positive

Zero

Simplest electrical circuits use:

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One wire

Two wires

Four wires

Five wires

The refractive index of ice is:

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1.00

1.33

1.31

2.42

Power of hair dryer is:

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1000 W

750 W

10 W

75 W

What is the voltage across a 6Ω resistor when 3 A of current passes through it?

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2 V

9 V

18 V

36 V

If the mass of the bob of a pendulum is increased by a factor of 3. The period of the pendulum's motion will:

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Be increased by a factor 2

Remain the same

Be decreased by a factor of 2

Be decresaed by a facro of 4

The point through which rays of light pass after reflection from concave mirror is called principal:

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Focus

Circle

Axis

Radius

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

The S.I unit of power of a lens is:

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Dioptre

Volt

Ampere

Watt

If X = A,B, then X is 1 when:

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A and B are 1

A or B is 0

A is 0 and B is 1

A is 1 and B is 0

An object is placed at the Centre of curvature of a concave mirror. The image produced by the mirror is located:

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Out beyond the centre of curvature

At the centre of curvature

Between the centre of curvature and the focal point

At the focal point

The current which changes its direction is called:

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Current

A.C.

Conventional current

D.C.

If a body revolves under centripetal force its angular acceleration is

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Non zero

Variable

Increasing

Zero

when a ball is throng straight up, the acceleration at its highest point is.

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Upward

Down ward

Zero

Horizontal

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

Oscillation of shock absorber of a car is practical example of.

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simple harmonic motion

Forced oscillation

Damped oscillation

Undamped oscillation

Turning of radio is example of.

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Mechanical resonance

Electrical resonance

Physical resonance

Biological resonance

Biomas is a potential source of

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Renewable energy

Non renewable energy

Botha a and b

Tidal energy

The magnifying power of an astronomical telescope is 10. If the focal length of objective is 100 cm, then what is the focal length of eye piece.

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10 cm

100 cm

1000 cm

5 cm

The resultant of two vectors having magnitude 10 N and 8 N Can not be

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2 N

9 N

18 N

20 N

In Michelson's experiment the relation used to find the speed of light is

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16 fc

1/16 fd

16 fd

16/fd

Horizontal range is maximum when the angle of projectile is.

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0 o

30 o

45 o

60 o

A body of mass 1.0 Kg dropped from the top of a tower of highest 50 m, what will be its K.E. 10 m below the top

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400 J

490 J

49 J

98 J

First spectral series of hydrogen atom was discovered by

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Lyman

Rydberg

Balmer

Paschen

If electron jumps from second orbit to first orbit in hydrogen atom it emits photon of.

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3.40 eV

10.20 eV

13.6 eV

3.8 eV

Electric power:

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Vx1

V²x1

V/1

V/1²

The first laser was built by

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ArthursSchawalow

T.H.Maiman

Peter Sorokin

C.H.Townes

Conductors have conductivities of order:

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10³(Ωm)-1

10⁷(Ωm)^-1

10⁷Ωm^-1

10^-6Ω

By modern system of NAVSTAR, the speed any where on the earth can be determined to accuracy about.

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20 ms-1

10 ms-1

2 cms-1

2 ms-1

An electron enters the magnetic field at right angle from left, B is into paper. The electron will be deflected.

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upward

To ward right

Down ward

Toward left

Recently superconductor discovered is at temperature.

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110K

143K

16.3K

119K

If F1 and F2 are teh magnetic forces acting on a particle and electron respectively when moving perpendicular to the magnetic field then.

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F1=F2

F1>F2

F1<F2

F1 = 4F2

Specific resistance of a material depends upon.

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Length

Area

Temperature

Both A and B

When a motor is over loaded then the magnitude of back emf.

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Increases

Decreases

Remain constant

Zero