Question # 1

A 100 Kg car is moving at the speed of 10 m/sec and comes to rest after covering a distance of 50 m. The amount of work done against the friction is:

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+5 X 10¹J

+5 X 10²J

+5 X 10³J

+5 X 10⁴J

The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:

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Ultra red region

Visible region

Ultraviolet region

Any of these

None of these

In and A.C. circuit, the current lags behind the emf. The power factor is 50% In order to make it 100%, What additional component is to be used?

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Impedance

Inductance

Capacitance

Resistance

Suppose the water flows out from a pipe at 3kg s^-1and its velocity changes from 5m s^-1to zero on striking the wall, then the force exerted by water on wall will be

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5 N

10 N

15 N

20 N

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

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Maximum

Minimum

Zero

Unity

It is possible to recognize a person by hearing his voice even if he is hidden behind a solid wall. This is due to the fact that his voice

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Has a definite pitch

Has a definite quality

Has a definite capacity

Can penetrate the wall

Neutron was suggested to be in the nucleus by:

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Rutherford in 1920

Bohar in 1913

Dirac in 1928

Anderson in 1932

None of these

When a body is moving with uniform positive acceleration, the velocity- time graph is a straight line. Its slope is

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zero

negative

positive

non-existing

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

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

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Peak value

RMS value

Instantaneous value

Peak-to-peak value

Both (A) and (C0

The work done by a force, keeping an object in circular motion with constant speed is:

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Zero J

1 J

0.1 J

0.01 J

If a force of 0.05 N produces an elongation of 20 mm in 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

One newton is a force that produces an acceleration of 0.5 m/sec²in a body of mass:

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2 Kg

3 Kg

4 Kg

8 Kg

The blood pressure of a person

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decrease with age

increase with age

has no effect with age

none of them

The amount of coal used since 1945 up till now as compared to that used in the whole of history before that is

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Much more

Very small

No amount at all

None of these

When transistors are used in digital circuits they usually operate in the

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Active region

Breakdown region

Saturation and cutoff regions

Linear region

A meter wire carraying a current of 2A is at right angle to the uniform magnetic field of 0.5 Weber/m²The force on the wire is

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5N

4N

1.5N

6N

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

In a metal, the valence electrons are:

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Attached to individual atoms

Not attached to individual atoms

Free to move within the metal

Both A and B

Both A and C

Recently a complex crystalline structure known as Yetrium Barium Copper Oxide have been reported to become superconductor at

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125 K

25 K

263 K

163 K

With age, least distance of distinct vision:

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Increases

Decreases

Is not affected

None is correct

Which one of the following elasticizes is possessed by fluids:

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Young's elastic modulus (length)

Bulk elastic modulus (volume)

Modulus of rigidity (shape)

None of these

In a transistor, collector current is controlled by

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Collector voltage

Base current

Collector resistance

All of the above

The density of blood is nearly equal to that of

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mercury

sodium

water

honey

The Nobel Prize on the explanation of photoelectric effect was awarded to:

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Max. Planck

Maxwell

Bohr

Rutherford

None of these

The graphical representation of ohm's law is

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hyperbola

straight line

ellipse

parabola

Electron is a particle whose mass is:

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Greater than that of a proton

Smaller than that of a proton

Smaller than that of a proton or a neutron

Greater than that of an atom

The second law of thermodynamics is concerned with the circumstances in which

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heat can be converted into work

direction of flow of heat

none of them

both of them

Distance covered by a freely falling body in 2 sec will be

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4.9 m

19.6 m

29.2 m

44.1 m

A labourer carrying a distance a load on his head moves from rest on a horizontal road to another point where he comes to rest. He has done:`

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Minimum work

Maximum work

Zero work

Negative work

The terminal velocity of a small size spherical body of radius R moving in a fluid varies as

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R

R²

1/R

(1/R)²

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