Question # 1

Which one of the following converts light energy into electrical energy?

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Electric bulb

Electric generator

Photo cell

Electric cell

The devise used to measure the atmosphere pressure is:

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Rain gauge

Vacuum cleaner

Screw gauge

Barometer

Water is _________ conductor:

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Best

Bad

Good

Poor

The altitude of geostationary orbits in which communication satellites are launched above the surface of the Earth.

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850 km

1000 km

6400 km

42,300 km

Sin 45^ois

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0.707

0.5

1

0.2

Kilowatt - hour is unit of _____________

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Power

Energy

Work

K.e

Which gas behaves as glass or polythene to radiation:

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Nitrogen

Hydrogen

Carbon di oxide

Methane

Things with _____________ area are more stable>

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Larger

Smaller

All

None of these

A body OF mass 10 kg taken to height of 5m:

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P.E = 500 J

P.E = 50 J

P.E = 5 J

P.E = 5000 J

Air and water is conductor:

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Poor

Good

Excellent

None of these

A ball of mass 1 kg moving with velocity 2 ms-1, Its momentum will be

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1 Ns

2 Ns

0.5 Ns

4 Ns

That period in which voltage repeats its value in equal intervals is called:

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cycle

Time period

Frequency

Amplitude

When a current carrying conductor is placed in magnetic field at right angle to it. The direction of force acting upon it is:

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The same as direction of field

Opposite the direction of field

Makes an angle of 45^owith the current

At right angle to both the field and the current.

D.C. motor converts.

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Mechanical energy into electrical energy

Mechanical energy into chemical energy

Electrical energy into mechanical energy

Electrical energy into chemical energy

At mean position of pendulum, the potential energy of the pendulum is:

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Maximum

Minimum

Much more

Both a and c

A positive electric charge:

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Attracts other positive charge

Repels other positive charge

Attract a neutral charge

Repels a neutral charge

The time period of simple pendulum can be calculated by:

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T = 2π√L/g

T = 2 π √m/k

T = 2 π √g/L

T = 2 π √K/m

Power of hair dryer is:

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1000 W

750 W

10 W

75 W

In simple harmonic motion, the acceleration of the body is…………. Proportional to the displacement.

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Inversely

Directly

Equally

Ration

When an electric current passes through a conductor, which field is produced around it?

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Electric field

Magnetic field

Gravitational field

Electrostatic field

Which instrument is used to detect current:

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Galvanometer

Voltmeter

Ammeter

Electroscope

the number of waves passing through a point in one second is called:

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time period

cycle

frequency

amplitude

Which one is renewable source of energy.

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Coal

Uranium

Biomass

Natural gas

The final image formed by a simple microscope.

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Virtual and inverted

Real and erected

Virtual and erected

Real and inverted

A convex lens can be used as

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Simple microscope

Compound microscope

Telescope

Spectrometer

The weight of the body at the centre of earth is

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Maximum

Minimum

Zero

Infinite

In red light is used as compare to blue light then fringe spacing.

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Decreases

Remain same

Increases

Becomes zero

The produce oscillation, body is pulled away from its

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Mean position

Extreme position

Both a and b

None of these

A body starting from rest attains angular acceleration of 5 rad s-2 in 2 second final angular velocity will be.

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10 rad s-1

7 rad s-1

3 rad s-1

2 rad s-1

More details of an object can be seen with a microscope by using

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Green light

Red light

Yellow light

Blue light

At which of the following temperature a body has maximum internal energy.

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-273 ^oC

0 K

273 K

-273 K

The acceleration of a projectile along x axis is.

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Zero

Increase

Decrease

Equal to 'g'

This is used for

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Co-efficient of friction

Co-efficient of expansion

Co-efficient of viscosity

Co-efficient of contraction

A two inputs NAND gat with inputs a and b has an output '0' if.

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B is zero

A is zero

Both A and B are 1

Both A and B are '0'

One henry is equal to

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1 ohm x 1 sec

1 ohm x 1 hertz

1 ohm x 1 metre

All of above

substance which undergo plastic deformation until they break are known as.

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Brittle substances

Ductile substance

Non magnetic substance

Magnetic substance

One joule is equal to.

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1.6 x 10¹⁹ eV

1.6 x 10^-19 eV

6.25 x 10^-18 eV

6.25 x 10 ¹⁸ eV

The heat produced by passage of current.

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H=I²Rt

H=IR2T

H=I/Rt

H=I²/Rt

Coulomb's force is:

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Conservative force

None conservative force

Similar to frictional force

None of the above

A radio active substance has a half life of four months. 3 -fourth of the substance will decay in:

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6 months

8 months

12 months

16 months

A charge Q is divided into tweo parts q and Q-q and seperated by a distance R. The force of equilibrium between them will be maximum when:

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q=Q/4

q=Q/2

q=Q

None of these

DC generator by william Sturgeon in:

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1894

1961

1834

1961

How many times, the alpha particle is more massive than electrons.

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6332

7332

8332

9332

The head produced by the passage of current through a resistor is.

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H= I²Rt

H = IR²t

H = 1/Rt

H = I²/Rt