Question # 1

The dimensions of viscosity are:

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M²L^-1T^-2

M^-1L¹T^-1

M^-1L^-1T

ML^-1T^-1

The definite number of significant figures in 5000 is:

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Four

Three

Two

One

The time taken by light to travel from moon to earth is:

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80 sec

500 sec

1.802 X 10⁴sec

Aerophysics

Neutron was discovered in

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1915

1920

1925

1932

The unit of resistance is

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volt

ampere

ohm

coat

An object moving through a fluid experiences a retarding force called a

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frictional force

terminal force

opposing force

drag force

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance

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Increase k time

Decreases k times

Decreases 1/K times

Remains unchanged

Which of the following material has smaller has life

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uranium

polonium

radium

radian

If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at:

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5 cm

10 cm

15 cm

20 cm

The SI unit of flux density is.

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Tesla

Weber

Gaun

Weber/meter

The rate of decay of radioactive substance

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is constant

decrease exponentially with time

varies inversely as time

decreases linearly with time

A simple astronomical telescope consists of

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Two convex lenses

Three convex and one cocave

Two concave lens

None of these

An object moving with acceleration g is said to fall freely identify freely falling objects from the list given below

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An orange falling from a tree

A satellite orbiting around the earth

A football kicked in the air

All of these

If the velocity of a body becomes double and mass becomes half then its K.E

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Becomes double

Becomes four times

Is halved

Becomes eight times

If stress is increased beyond the elastic limit a permanent change in the material is observed This behavior is called

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Elastic deformation

Elasticity

Plasticity

Yield strength

If the angle of refraction is 90^o, for which the angle of incidence is called

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Incident angle

Critical angle

Angle of emergence

None of these

The sum of the magnitude of two forces acting at a point is 18 and the magnitude of their resultant is 12.If the resultant is at 90° with the force of the smaller magnitude then their magnitudes are:

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3, 15

4, 14

5, 13

6, 12

Satellites are objects that orbit around the

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Sun

Planet

Earth

None of these

If the line of action of force F passed through the axis of rotation or origin then its torque is

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Maximum

Minimum

Zero

None of these

The unit of inductance is equivalent to

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∨xs/A

∨xA/s

∨ x s/v

∨/A x s

Blood vessels are not

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Flexible

Rigid

Some times flexible

None of these

Alexander graham bell transmits a voice message via a

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Beam of light

Telescope

Compound microscope

Mirror

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