Question # 1

A dirty carpet is to be cleaned by heating. This is an accordance with____ law of motion:

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First

Second

Third

None of these

The total work done in moving the body up and then down through the same height in a gravitational field is equal to:

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mgh

Its wight

Weight X height

Zero

If a given spring of spring constant K is cut into two identical segments, the spring constant of each segment is:

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K/2

2 K

4 K

None of these

Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current

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Of same magnitude in the same direction

Of different magnitude in the same direction

Of same magnitude but in opposite direction

Of different magnitude in the opposite direction

None of these

the symbol to be used in relativity problems denotes:

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Dilated time

Proper time

Life time

Half time

None of these

When the object lies between F and 2F, the image formed by is formed at:

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Real

Virtual

Diminished

Erect

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

The sum of positive and negative peak values is called:

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Instantaneous value

Peak value

Rms valuie

Peak-to peak-value

None of these

Photoelectric effect takes place with a photon of:

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Very high energy

Very low energy

Low energy

High energy

None of these

The work done on the system by the environment is considered as

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positive

negative

zero

any one of them

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

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zero

small

large

very large

Period of audible sound waves is

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1 × 10^-4 sec

1 × 10^-3 sec

1 × 10^-2 sec

1 × 10^-1 sec

A body of mass 'm' is moved to a height 'h' equal to the radius of the earth.The increase in potential energy is

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2 mgR

mgR

1/2 mgR

1/4 mgR

The relative permitivity ∈_r for teflon is

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2.1

2.4

2.9

3.0

Velocity time graph can also be used to determine

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Distance

Velocity

Acceleration

None of these

The moon produces the tides raise the water in the sea roughly

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Once a day

Twice a day

Several a day

None of these

The velocity of a body at some particular instant is called

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Initial velocity

Instantaneous velocity

Variable velocity

None of these

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

What is work done in hitting a 10 kg load of bricks to the top of a building 20 m height ?

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98 J

200 J

980 J

1960 J

Height at which value of 'g' becomes one-fourth to hat on earth is

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R

2R

(3/2)R

4R

Who attempted to measure the speed of light

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Gallileo

Michelson

Newton

None of these

The experimental evidence in support of wave theory in Huygen's time was

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not present

not convincing

convincing

none of them

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