Question # 1

A 1500 kg car has its velocity reduced from 20 ms^-1to 15ms^-1in 3.0 S. How large was the average retarding force

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-4.5 KN

-2.5 KN

-3.7 KN

-4.3 KN

Mathematically the vertical velocity component is

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The low blood pressure is known as

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Diastolic

Systolic

Low blood pressure

None of these

The direction of a vector in a space is specified by

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One angle

Two angles

Three angles

Cannot be specified

The magnetic field produced due to the current in a straight wire is proportionalto the :

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Electric current

Conducting material

Length of the wire

Diameter of the wire

If the tensile force is suddenly removed from a wire then its temperature will

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Decrease

Increase

Become zero

Remain constant

If V denotes volume of the liquid coming out of a pipe per second, v is velocity and A as area of the pipe, then the correct formula will be:

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V = v x A

v = V x A

A = v x V

None of these

Curie is the unit of

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decay constant

activity

half-life

average life

Measurement of a standard metre in terms of the wavelength of red cadmium light is

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1,563,163.5

1,553,363.5

155,553.5

1,553,163.5

Longitudinal waves do not exhibit

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Refraction

Reflection

Diffraction

Polarization

The light which has components in all directions is called

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unpolarized light

polarized light

intense light

none of them

In compound microscope the focal length of eye piece is

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Large

Small

Same as objective

None of these

A unit vector may be defined by the

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Surface

Direction by normal drawn vector

Along the direction of surface

a and b

A force of 50 dynes is acted on a body of mass 5 g which is at rest.for and interval of 3 seconds,then impulse is

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0.15 x 10^-3 Ns

0.98 x 10^-3 Ns

1.5 x 10^-3 Ns

2.5 x 10^-3 Ns

The twinkling of stars is due to

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The fact that stars do not emit light continususly

The refractive index of the earth's atmosphere fluctuate

Intermittent absorption of star light by its own atmosphere

None of these

An image formed by a concave lens is always

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Virtual

Real

Inverted

None of these

Laws of motion are valid in a frame which is

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Uniform motion

Inertial

Both a and b

None of these

The typical speed of human swimming is

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1.5 ms^-1

2 ms^-1

2.5 ms^-1

3.0 ms^-1

Moment of inertia of a sphere is

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1/3 mr²

3/4 mr²

4/5 mr²

2/5 mr²

A rain drop of radius r falls from a certain height h above the ground. The work done by the gravitational force is proportional to

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r

r²

r³

r⁴

In uniform circular motion the angular acceleration vector is

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Constant in magnitude and direction both

Constant in magnitude only

Constant in direction only

Varies in magnitude and direction both

A container has a small hole in the bottom.Air can go through this hole,but water cannot,this can be best explained by the statement that

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Water contains hydrogen atoms,air does not

Water molecules are larger than molecules in the air

Water molecules are smaller than molecules in the air

Surface tension of the water prevents it from

An oil surface floating on water surface exhibits beautiful colour patter, which is due to

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Reflection of light

Diffraction of light

Interference of light

None of these

The optical resolution of microscope or a telescope tells us how close together, the two point sources of light can be so that they are still seen as two separate sources

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Angular magnification

Resolution

Magnification

None of these

When heat is added to the system, the entropy change is:

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Positive

Negative

Zero

None of these

Human body is composed of particles to produce electric force are

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Atoms

Molecules

Charges

All of them

S.I. unit of angular velocity of

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Radian per second

Revolution per minute

Degree per second

None of these

The acceleration of a body at some particular instant is called

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Initial acceleration

Variable acceleration

Instantaneous acceleration

None of these

The blood vessels are inflated eve in

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Relaxed states between heart beat

Working state between hear beat

Occasionally

None of these

The wavefront formed at very large distance from the source is:

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Cylindrical

Spherical

Elliptical

Plane

A cylinder cannot roll on

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A rough horizontal plane

A smooth horizontal plane

A rough inclined plane

A smooth inclined plane

A gas STP is slowly compressed to one fourth of its original volume, then final pressure is

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4 atmosphere

0.75 atmosphere

8 atmosphere

0.25 atmosphere

A second pendulum is mounted in a rocket.Its period of oscillation decreases when the rocket

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Comes down with uniform acceleration

Moves round the earth in a geostationary orbit

Moves up with a uniform velocity

Moves up with uniform acceleration

Range of projectile is maximum when thrown at an angel of

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30°

60°

45°

75°

In multi-mode step index optical fibre, that layer is called cladding which has

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higher refractive index

lower refractive index

both of them

none of them

Two bullets are fired simultaneously,horizontally and with different speeds from the same place.Which bullet will hit the ground first?

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The faster one

Depends on their mass

The slower one

Both will reach simultaneously

The property of light which makes light possible to be transmitted into inaccessible place is

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Interference

Diffraction

Polarization

None of these

A Carnot engine works between 600K and 300. If heat input is 100J then the output is

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300 J

400 J

50 J

56 J

Acceptor impurities donate

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Holes

Electrons

Both Electrons and Holes

None of them

The direction of torque is

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The same as the direction of the corresponding applied force

Opposite to the direction of the applied force

Perpendicular to the direction of the applied force

Parallel to applied force

The maximum range of the projectile is the horizontal distance covered is

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Maximum

Distance

Minimum

None of these

Which one the following gives three regions of electromagnetic sepctrum in order of increasing wavelength?

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Gamma rays, micro waves, visible light

Radio waves, ultraviolet waves, X-rays

Ultraviolet rays, Infrared rays, micro waves

Visible light, gamma rays, radio waves

For an elliptic orbit, the satellite has speed of

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30,0000 kmh^-1

35,000 kmh^-1

37,000 kmh^-1

None of these