Question # 1

A string is stretched by two equal and opposite force 10 N each. The tension in the string is:

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Zero

5 N

10 N

20 N

____________ deals with temperature .

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Bio physics

Geophysics

Thermo physics

Plasma physics

If the force of 25 N pulls a stone through a distance of 5 cm in its direction the magnitude of work will be:

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5 J

125 J

175 J

200 J

Unit of strain is

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Nm

N

Both a and b

No unit

Quantities between which a graph is plotted are called.

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Scalars

Vectors

Variables

None

Which quantity is scalar?

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Force

Power

Velocity

Torque

The value of 'g' on the surface of moon is:

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1.62 ms^-2

10 ms^-2

20 ms^-2

Zero

The unit of acceleration is.

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ms-1

ms

ms^-2

ms²

Centre of gravity of sphere is at:

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Centre of sphere

Outside of sphere

Radius of sphere

None of these

The product of force and displacement is called;

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Work

Efficiency

Power

Energy

____________ is bad conductors of heat:

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Copper

Water

Wire

Nil

The pitch of a sound is most closely related to its:

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Wave form

Period

Amplitude

Frequency

Power of hair dryer is:

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1000 W

750 W

10 W

75 W

The ray of light striking to the side of prism is called:

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refraction ray

incident ray

reflected ray

emergent ray

The product of frequency and wavelength is equal to:

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Time period

Amplitude

Wave speed

Wave energy

When a ray of light enters from denser medium to rare medium, the angle of incidence for which angle of refraction is 90^o is called:

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angle of incidence

critical angle

angle of refrection

None of these

The loudness of sound is most closely related to its:

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Freqeucy

Period

Wavelength

Amplitude

The step-up transformer

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Increases the input current

Increase the input voltage

Has more turns in the primary

Has less turns in hte secondary coil

When a heavy nucleus splits into, lighter nuclei, the process would .

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Release nuclear energy

Absorb nuclear energy

Release chemical energy

Absorb chemical energy

the resistance of an ammeter should be:

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high

very high

low

constant

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 logical operation performed by this gate is:

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AND

NOR

NAND

OR

Unite of thermodynamics scale of temperature is.

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Centigrade

Fahrenheit

Kelvin

Celsius

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 velocity of a particle having SHM is 'v' at means position. If its amplitude is doubled them velocity at mean position will be

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v/2

v

2v

4 v

A double convex lens acts as diverging lens when the object is

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At infinity

Inside the focus

A way from focus

A a large distance from lens

For a rocket , the change in momentum per second of the ejecting gases is equal.

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Acceleration of the rocket

Momentum of rocket

Velocity of rocket

Thrust acting on rocket

Pressure 'P' of a gas is defined as

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F/A

FA

F/V

F/D

In matter, the Atoms are in a state of never ending

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Motion

Rest

Change

State of decline

the example of mechanical waves is

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Water waves

Infrared waves

Radio waves

Ultraviolet waves

If a body of mass 5 kg is raised vertically through a distance of 1 m, then work done is.

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49 J

4.9 J

490 J

0.49 J

The magnification of a convex lens of focal length 5 cm is equal to.

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5

6

10

23

The unit of rotational K.E. is

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rAD/SEC

Js

J

Kgm2

By emitting Beta particle and gama particle simultaneously the nucleolus changes in its charges by

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N

N/2

N/4

3N/4

Which of the following is similar to electron.

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Beta particle

Alpha particle

Neutron

Proton

Ampere's law is applicable to:

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Circular path

Rectangular path

To any closed path

Nonwe of these

In gas the charge carriers are:

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Electrons

Ions

Both a & b

None of above

when an inductor comes close to a metallic object, its inductance is.

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Decreased

Increased

Becomes half

Becomes 4 times

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

The emission of electrons from metal surface when exposed to light is called:

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Compton effect

Pair production

Photoelectric effect

None of above

There is no charge in A and Z of any radioactive element by the emission of.

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Alpha particle

Beta particle

Gama particle

X- rays

The ratio of potential barriers of Ge to Si at room temperatrue is.

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7:3

1:3

2:5

3:7

When transistor are used in digital circuits they usually operate in the :

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Active region

Break down region

Saturation & cutoff regions

Linear region

Unit of decay constantλ is:

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ms

m^-1

m

S^-1