Question # 1

Satellites are held in orbits around Earth by its:

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Gravitational field

Magnetic field

Own orbital motion

Own spin motion

Physics details with the study of:

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Matter

Energy

Both of them

Human body

The net force acting on a 100 kg man standing in an elevator accelerating downward with a = 9.8 m sec^-2comes out to be

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980 N

580 N

1380 N

Zero

Transformer is used to

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Increase alternating current

Increase d.c voltage

Increase & Decrease emf

All answers are right

Which one of the following relations is correct?

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1 Wb-m²= Nm^-1A^-1

1 tesla = 104 gausses

1 Wb-m²= 1 tesla

All of the above

If a wave can be polarized, it must be

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An electromagnetic wave

A longitudinal wave

A progressive wave

A transverse wave

The current in LCR circuit will be maximum whenωis

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As large as possible

Equal to natural frequency of LCR system

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

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how heat is absorbed

how heat extracted

how this conversion takes place

none of them

SI unit of current describes the flow of charge at the rate of

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One ampere per second

One coulomb per second

One electron per second

6.25 x 10¹⁸electrons per second

Both B and D

The voltage increases linearly with

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time

velocity

acceleration

torque

The gavanometer constant of a moving coil galvanometer is given by

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K=BAN/C

K=BN/CA

K=NAC/B

K=C/BAN

The total internal reflection takes place for glass-air boundary is then the angle is

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Equal to 41.8^o

Greater than 41.8^o

Less than 41.8^o

None of these

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

The magnetic fields are produced by the

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Moving charges

Bar magnets

Motion of conductor in a magnetic field

All of them

Which of the following quantity is expressed as force per unit area?

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Work

Pressure

Volume

Area

Pico is the prefix for

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10^-10

10^-12

10^-15

10^-18

The low blood pressure is known as

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Diastolic

Systolic

Low blood pressure

None of these

The SI unit of strain is

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N

dynes

pascal

dimensionless

According to the Hooke's law the force required to change the length of a wire by '1' is proportional to:

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1^-2

1^-1

1

Polymers have naturally combinations like with

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Oxygen

Sulphuric

Hydrocarbons

Oxygen and carbons

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All the food you eat in one day has the energy equivalent to petrol of

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1/5 litre

1/3 litre

1/8 litre

1/6 litre

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