Question # 1

The results of mechanical tests are usually expressed in terms of

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stress

strain

stress and strain

neither strees nor strain

The restoring force is ______ amd opposite to the applied force within _____:

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Equal, elastic limit

Different, the walls of the laboratory

Different, elastic limit

None of these

The characteristic of a body executing S.H.M is that its acceleration is

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inversely proportional to displacement

directly proportional to displacement

independent of displacement

equal to zero

10 c.c. each of oxygen and hydrogen are kept in separate flasks. Then which of the following relations is correct?

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Each have same number of molecules

Don't have same number of molecules

Can't be predicted

None

A vector which has magnitude 'one' is called:

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Resultant vector

A unit vector

Position vector

None of these

Which quantity is important in stating the entropy of the system

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initial entropy

final entropy

change in entropy

none of them

Coulomb's force between two point charges depends upon

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Magnitude of charges

Distance between them

Medium in which they are located

All of the above

The efficiency of diesel engine is

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25%

25 - 30%

35%

35 - 40%

When quarter of a circle is completed, phase of vibration is:

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90°

180°

45°

360°

If a force of 0.05 N produces an elongation of 20 mm in a string, then its spring constant will be:

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250 N m^-1

25 N m^-1

2.5 N m^-1

None of these

Practically the quantity v/c is always:

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less than one

Equal to one

Greater then one

all of these

None of these

The SI unit of magnetic flux is.

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weber

Nm^-1A^-1

tesla

gauss

SHM is type of ______ motion

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Vibratory

Linear

Circular

None

Cosine of an angle is positive in:

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2nd quadrant

3rd quadrant

4th quadrant

All of these

If d is the displacement of the body in time t, then its average velocity will be

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V_av= d x t

V_{av = t/d}

V_{av = d/t}

Electrostatics is the branch of physics which deals with the study of electro charges:

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At rest

At rest under the action of electric forces

In motion under the action of electric forces

In motion

At rest under the action of nuclear forces

Triple point of water is

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273.16°F

372.16K

273.16°F

273.16

The SI unit of electric flux is

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Weber

Nm²C^-1

NmC^-1

Nm^-2C

If a ball comes back to its starting point after bouncing off the wall several times, then its

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total displacement is zero

average velocity is zero

none of them

both of them

The direction of velocity is along the direction of

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distance

displacement

acceleration

all of them

A tube is tapered from 20 cm diameter to 2 cm diameter, the velocity at the first cross-section is 50 cm/s, then the velocity at the second cross-section is

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50 m/s

20 m/s

40 cm/s

5 cm/s

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

A thermistor is a resistor which is:

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Light Sensitive

Heat Sensitive

Sound Sensitive

All of these

None of these

A body moving along the circumference of a circle of radius R completes one revolution. The radius of the covered path to the angle subtended at the center is:

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Radius of the circle

Twice the radius

Thrice the radius

None of these

A field in which the work done in moving a body along closed path is zero is called

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Nuclear Field

Conservative field

Gravitational field

Non-conservative field

The path described by a projectile is called its

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orbit

trajectory

range

distance

A body is executing free vibrations when it oscilates

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with the interference of an external force

without the interference of an external force

with the interference of an internal force

none of them

The vector representation of force experience give the direction of

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magnetic field

current

length of conductor

force

Resistor is a device which convert electric energy to

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Heat energy

Chemical energy

Elastic energy

All of the above

Photocell is a device which converts

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chemical energy into electrical energy

electrical energy into light energy

heat energy into electrical energy

light energy into electrical energy

Work done is maximum when angle between force and displacement is

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0°

90°

180°

None of these

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