Question # 1

Work done along a closed path in a gravitational force is:

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maximum

Minimum

Zero

Unity

When quarter of a cycle is completed, the phase of vibration is:

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90°

180°

45°

360°

The substance in which atoms are so oriented that the field produced by spin and orbital motion of the electrons might add up to zero,are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

A stone is dropped from rest from the top of a tower 19.6 m high. The distance traveled during the last second of its fall is (giving g=9.8 m/s^s)

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9.8 m

14.7 m

4.9 m

19.6 m

From the theory of relativity, momentum p of the photon is related to energy as

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p = hfc

p = hf/c

p = f(hc,f)

p = cf/h

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

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1890

1895

1900

1905

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

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0.52 A

1 mA

0.7 mA

1.4 A

What is the current is a 2 x 10⁶ohm resistor having a potential difference of 2 x 10³volts?

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10^-1A

10^-2A

10^-4A

1 mA

A train cover 90 km in half an hour. the time taken by it to travel 15 km will be:

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20 minutes

48 minutes

10 minutes

5 minutes

In a three phase a.c generator if the first coil has a phase 0, then the other two coils will have phases

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90° - 120°

20° and 140°

120° and 240°

120° and 140°

Truth of kinetic energy is confirmed by:

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Diffusion of gases

Brownian motion

Both A and B

None of these

A stone is dropped from rest from the top of a tower 19.6m high.The distance traveled during the last second of its fall is (giving g = 9.8 m/s²)

Choose an answer

9.8 m

14.7 m

4.9 m

19.6 m

For assessment of total uncertainty when added or subtracted the absolute uncertainties are

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Multiplied

Divided

Added

Subtracted

A geometric shape of a solid obtained by regular, respetive, three-dimensional arrangements of its molecules,atoms or ions is called a:

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Crystal

Crystal Lattice

Crystal plane

None of these

Two projectiles are fired from the same point with the same speed at angles of projection 60° and 30° respectively.Which one of the following is true?

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Their range will be same

Their maximum height will be same

Their landing velocity will be same

their time of flight will be same

The minimum distance between a source and the screen for which a real image is possible with a convex lens is

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Its focal length

Twice the focal length

Four times the focal length

Square of the focal length

The synchronous satellites are very useful for

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Worldwide communicatioin

Weather observations

Navigation

All of these

Arsenic, antimony and phosphorous are the elements from

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third group

fourth group

fifth group

none of them

A metal ball hangs from a spring balance which is placed on the wall of an elevator under freefall. Why does the spring balance show a weight of o(zero)N?

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because the ball is in free fall

because the spring balance is in free fall

both a and b

because the spring balance exerts no force on the ball

Salters duck is consists of

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Duck float

Body float

Balance float

a and c

Two sources are said to be coherent if they have:

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Same amplitude

Same wavelength

Definite phase relation with each other

None of them

A body moving with uniform velocity has

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positive acceleration

negative acceleration

infinite acceleration

zero acceleration

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