Question # 1

Work done is maximum when angle between force and displacement is:

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0°

90°

180°

None of these

Work has the dimensions as that of

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Torque

Angular momentum

Linear momentum

Power

The induced emf in a coil is proportional to:

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Magnetic flux through a coil

Rate of change of magnetic flux through the coil

Area of the coil

Product of magnetic flux and area of the coil

Potentiometer is more sensitive than voltmeter, because

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Voltmeter has a very high resistance

Voltmeter has a very low resistance

Potentiometer does not draw any current from a source of unknown potential difference

Potentiometer is sensitive

The materials in which there are plenty of free electrons for electrical conduction are known as

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conductors

insulators

semi-conductors

all of them

In the formula B= µ̻ nl, the symbol n denotes:

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Total number of turns of solenoid

Number of turns per unit length

Number of turns per unit volume

Numbers of turns per unit area

Number of moles

The charge per unit time through any cross-section of a conductor is called

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capacitance

electric power

current

potential difference

The location and speed anywhere on earth can now be determined using relativistic effects by NAVISTAR to an accuracy of

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2 cm/s

20 cm/s

200 cm/s

2000 cm/s

Electric generators which convert mechanical energy into

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solar energy

thermal energy

kinetic energy

electrical energy

The time interval during which the Voltage source changes its polarity once is known as:

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Time period T

Half the time period

Quarter the time period

Two third of the time period

None of these

X-rays produced in a tube operating at 10⁵V. The speed of X-rays produced is

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3 x 10⁸m/s

3.1 x 10⁸m/s

2.8 x 10⁸m/s

1.88 x 10⁸m/s

Energy can be added to a system even though heat transfer is

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Maximum

Minimum

Zero

None of these

Total area of cross section is 0.25 m². If blood is flowing at rate of 100 cm³ /s then average velocity of flow of blood through capillaries is

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4mm/s

0.4mm^-1

400mms^-1

None

An accurate measurement is the one which has

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Percertainity

Less percentage uncertainty

Less fractional uncertainty

b and c

The moment of inertia of a body does not depend upon its

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Angular velocity

Mass

Distribution of mass

Axis of rotation

The time taken by the light to travel from Sun to Earth is

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4 min 20 sec

5 min 20 sec

8 min 20 sec

9 min 20 sec

A long them flat sheet has a uniform surface charge density σ. The magnitude of the electric field at a distance 'r' from it is given by

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σ/∈_o

σ/2∈_o

σ/∈_or

σ/2∈_or

The turning effect of a force is called:

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Acceleration

Torque

Velocity

Momentum

The speed of light in a medium of refractive index 1.5 is

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3 x 10⁸ms^-1

4.5 x 10⁸ms^-1

2.0 x 10⁸ms^-1

None of these

Hotness or coldness of an object is expressed in terms of a quantity called

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Heat

Temperature

Kelvin

None of these

A charge Q is divided into two parts q and Q - q and separated by a distance R.The force of repulsion between them will be maximum when:

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q = Q/4

q = Q/2

q = Q

None of these

In coordinate axes, the left ward forces are taken as

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Positive

Negative

Just units only

None of these

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