Question # 1

The total energy of spring mass system is

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zero

changing with time

constant

none of them

Which of the following type of force can do no work on the particle on which it acts:

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Frictional force

Gravitational force

Electric force

Centripetal force

A body can have constant velocity when it follows:

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A circular path

A rectilinear path

Trajectory of a projectile

None of these

A spring of constant k = 0.4 N m^-1_{is to be extended thorugh 10 cm at a place where g = 10 m sec}^-2. The mass to be suspended should be:

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4 gms

0.4 gms

40 gms

None of these

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

SI Unit of work is

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Nm^-1

Joule

Nms

Both a and b

The reactance of a coil when used in the domestic A.C. power supply (220 volts, 50 cycles per second) is 50 ohms. The inductance of the coil is nearly

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2.2 henry

1.6 henry

0.22 henry

0.16 henry

The mass of fluid passing through any cross-section per unit time is called

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electric flux

magnetic flux

mass flux

none of them

Examples of physical quantities are:

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Length

Color

Effect of music

All of these

A body moves a distance of 10 m along a straight line under the action of a force of 5 N and work done is 25J. The angle which the force makes the direction of motion will be:

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60°

90°

30°

0°

The minimum charge on any object can not be less than

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1.6 x 10^-19C

3.2 x 10^-19C

1.0 C

4.8 x 10^-19C

A motorcycle driver double its velocity when he is having a turn.The force exerted outwardly will by

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Double

Half

4 times

1/4 time

When crest of one wave falls on the crest of the other wave. This phenomenon is known as:

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Destructive interference

Diffraction

Polarization

Constructive interference

The angular velocity of a particle rotating in a circular orbit 100 times per minute is

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1.66 rad/s

10.47 rad/s

10.47 deg/s

60 deg/s

The wave length of x-rays is of the order of

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10^-17 m

10^-4 cm

10^-9 m

10^-10 m

If temperature of the sink is decreased, efficiency of a carnot engine.

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Remains constant

Decreases

Increases

None of these

Electric flux depends upon

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The charge only

Medium only

Both charge & medium

Permittivity & area

One angshom is equal to?

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10^-8cm

10^-6m

10^-10nm

10^-8nm

When a ray of light enters a denser medium from a rarer medium,its:

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Wavelength increases

Velocity increases

Frequency decreases

Wavelength decreases

A human eye can detect the electromagnetic radiations of the type:

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Infrared radiations

For- infrared radiations

X-rays radiations

Red radiations

Gauss s law is applicable by considering Gaussian surface The Gaussian surface must has shape which is

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Spherical

Cylindrical

Box type

Any arbitrary closed shape

For which position will be maximum blood pressure in a body have the smallest value

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Standing upright

Sitting relaxed

Lying horizontally

Standing on one's head

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