Question # 1

Weight of the body is due to the :

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Gravitation force

Centripetal force

Centrufugal force

All of the above

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

What flower is known as natural thermometer?

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Rose

Barasicca

Crocus

Tulip

The process in which heat is transmitted form one body to another by the interaction of atoms and the movement of free electrons is known as

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convection

radiation

conduction

both (a) and (b)

How many components are there of a solar heating system?

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2

3

4

5

Gravitational constant depends on:

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Medium

Force

Weight

It does not depend son anything

Moon complete its one revolution around the earth is ___________ DAYS:

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29

27.3

30

21

If no external force acting on a body then such system is called.

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Ideal system

Controlled system

Isolated system

None

The momentum of two or more than two bodies intersacting remain constant in:

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Law of inertia

Isolated system

System

None

The direction of momentum is

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opposite to motion

Along the velocity

Perpendicular to motion

None of these

The fastest bird falcon has speed.

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100 kmh^-1

200 kmh^-1

300 kmh^-1

400 kmh^-1

Nuclear fission was first observed in

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1936

1937

1938

1939

The combined resistance of two identical resistors, connected in series is 8Ω. Their combined resistance in a parallel arrangement will be:

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2Ω

4Ω

8Ω

12Ω

Intensity level of the sound produced by mosquito buzzing is:

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70 dB

40 dB

10 dB

120 dB

The converter of analogue to digital signal is:

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ADC

DAC

ATDC

None of these

Radioactive isotopes present in atmosphere is

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Cobalt -60

Ph-32

Carbon -14

Carbon -20

When we heat the metal at high temperature they emit:

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Holes

Protons

Neutrons

Electrons

If the current in a wire which is placed perpendicular to a magnetic field increases, the force on the wire.

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Increases

Decreases

Remains the same

Will be zero

The loudness of sound is most closely related to its:

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Freqeucy

Period

Wavelength

Amplitude

The value or current I passing through a conductor is inversely proportional to:

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Temperature

Potential difference

e.m.f.

resistance

The unit of (ρ) in formula R=ρ.L/a is______________.

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Ω

Ω-m

Ω-m²

Ω-m^-2

At extreme position potential energy of the pendulum is:

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Maximum

Minimum

Both a and b

Zero

The force and torque are analogous to

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Velocity

Mass and weight

Moment of Inertia

Each other

If 332 waves pass through a medium in 1 second with speed of 332 ms-1 then wavelength will be

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7 m

332 m

664 m

1 m

Change of momentum is equal to

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Force

Tension

Impulse

Pressure

73.650 rounded off upto one decimal is

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73.6

74.00

73.7

73.65

The dimension of pgh has same as that of

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Work

Energy

Pressure

Mass

If the slope of a velocity time graph gradually decreases than body is said to be moving with

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Positive acceleration

Negative acceleration

Uniform velocity

None

Hygen's principle is used for.

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Explain polarization

Locate the wave front

Find the speed of light

Find the index of refraction

The formula for the power is

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P= W/d

P=W/v

P=W/t

P=Wt

No body begins to move or comes to rest of itself was given by

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Newton

Pascal

Bernoulli

Bu Ali Sina

Frequency range of hearing of cats is.

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20-20000 Hz

10- 10000 Hz

60-20000 Hz

60-70000 Hz

The period of the earth is equal to

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one lunar day

One astronomical

One Solar day

The half life of radioactive elements depends upon

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Temperature

Nature of element

Amount of the radioactive substance

Pressure

Dielectric constant _εr for air is:

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1

1.006

1.0002

1.0006

In three phase voltage across any two lines is about.

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220 V

230 V

400 V

430 V

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

The main reason for world wide use of A.C is because:

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It is very high power

It can be transmitted over long distance

It is cheaper to use

ALl of above

One ohm is equal to

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VC-1

CV-1

AC-1

VA^-1

There are different crystal systems. The number of these crystal system is.

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3

4

5

7

The SI unit of Stress is:

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Nm

Nm²

NM^-2

Nm³

The photon with energy greater than 1.02 MeV can interact with matter as.

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Photoelectric effect

Compton effect

Pair production

annihilation of matter

Thermistor with high - ve temperature coefficient are very accurate for measuring low temperature especially near is.

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10 kelvin

70 kelvin

200 kelvin

35 kelvin

The quantity/factor h/m_oc has the dimensions of.

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Length

Time

Mass

Energy