Question # 1

Drag force increases if speed of the object moving through the fluid:

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Increases

Decreases

Remains constant

None of these

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

In the study of thermodynamics, which gas is considered as the working substance

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real gas

ideal gas

any gas may be ideal or real

none of them

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory

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Refraction

Reflection

Diffraction

Formation of spectrum

Converse of pair production is known as

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Compton effect

annihilation of matter

photoelectric effect

none of these

The SI unit of capacitance is

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Farad

Henry

Ohm

Volt

According to Rutherford atomic model, the positive charge in an atom

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is concentrated at its centre

is in the form of positive electron at same distance from its centre

is spread uniformly through its volume

none of these

The combined effect of resistance and reactance in a.c. circuit is called

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conductance

resistance

impedance

choke

If the slope of the velocity-time graph increases at constant rate with time, then the body is said to have

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uniform deceleration

uniform negative acceleration

average acceleration

uniform positive acceleration

A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

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2R

4R

16R

Zero

Amperean path is a:

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Closed path

Rectangular path

Circular path

Any of above

Broken path

Mathematically the vertical velocity component is

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V_fy = Vi cos θ - gt

V_fy = Vi cos θ + gt

V_fy = Vi sin θ - gt

V_fy = Vi sin θ + gt

The escape velocity of Neptune in Kms^-1

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20.26

24.03

25.4

25.6

If the earth were to stop rotating, the value of 'g', the acceleration during to gravity at Delhi

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Increases

Decreases

Remains unchanged

Becomes zero

If the K.E.of a body becomes four times of the initial value.then new momentum will

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Become twice its initial value

Become three times.its initial value

Become four times.its initial value

Remains constant

The critical temperature for mercury is

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1.18 K

4.2 K

3.72 K

7.2 K

The particles equal in mass or greater than mass of protons are called:

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Leptons

Mesons

Baryons

Quarks

The energy stored in a dam is

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Kinetic energy

Electrical energy

Potential energy

None of these

The metals become a magnetic material because of their

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Hardness

Alignment of atoms

Structure

All of them

The direction of a vector in a space is specified by

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One angle

Two angles

Three angles

Cannot be specified

Two bodies of mass 1 kg and 2kg have equal momentum.Then the ratio of their kinetic energies is

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2 : 1

3 : 1

1 : 3

1 : 1

A ray of light reflected from a dense medium under goes a phase change of:

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30°

60°

90°

180°

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