Question # 1

The unit of spring constant is

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J-sec

Metre

Nm^-1

None of these

Laser is a beam of:

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Visible light

Infra red light

Ultra violet light

Violet light only

yellow light only

Where the streamlines are very far apart from each other, the pressure will be

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low

zero

high

all of them

The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is

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10 KJ

5 KJ

2 KJ

1 KJ

In case of metallic conductors, the change carries are:

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Protons

Electrons

Antiprotons

Positrons

Both (A) and (B)

What will be the ratio of the distance moved by a freely falling body from rest in 4th and 5th seconds of journey?

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4 : 5

7 : 9

16 : 25

1 : 1

The example of mechanical wave is

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waves in ropes

waves on water surface

waves in air

all of them

The error may occur due to:

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Negligence

Faulty apparatus

Inappropriate method

all of these

Acceleration in a body is always produced in the direction of :

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Velocity

Weight

Force

Both B and C

The value of electrical constant of proportionality k is

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9 x 10⁹Nm²C^-2

9 x 10^-9Nm²C^-2

9 x 10¹⁰Nm²C²

9.85 x 10^-12N^-1C^-2

The types of mechanical energy is/are:

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Kinetic energy

Potential energy

Both of these

None of these

N s m^-2is unit of:

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Drag force

Pressure

Surface tension

Coefficient of viscosity

If the velocity of the body decreases non-uniformly then the slope of the velocity-time graph will have

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different values

same values

zero valves

constant valves

Work-energy principle states that work done on the body by applied force is equal to change in:

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Potential energy

Kinetic nergy

Linear momentum

None of these

If volume of wire is 'AL' and there are 'n' numbers of charge carriers per unit volume, then the total number of charge carriers are

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n/AL

Al/n

nAL

nA/L

The charge carries in the electrolyte are:

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Positive ions

Negative ions

Either (A) or (B)

Both (A) and (B)

Neither (A) nor (B)

A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is

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Two

1/2

Zero

3/2

In a capacitive circuit

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Current leads voltage by phase ofπ/2

Voltage leads current by phase ofπ/2

Current and voltage are in same phase

Sometime current and sometime voltage leads

When charged particle is projected perpendicular to a uniform magnetic field its trajectory is

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circular

elliptical

cycloid

straight line

Bernoulli's equation is based upon law of conservation

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Mass

Momentum

Energy

None of these

When certain nucleus emits aβ-particles, is mass number:

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Remain same

Increases by one

Decreases by one

Decreases by four

None of these

When a charged particle passes through matter, it produces ionization, this effect is used in

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fission reaction

reactor

radiation detector

fusion reaction

The current sensitivity of the galvanometer is

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C/BAN

BAN/C

CAN/B

CBN/A

Lens's law deals with the

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Magnitude of induced current

Magnitude of induced e.m.f

Direction of induced e.m.f

Direction of induced current

A non-inertial frame of reference is that frame of reference in which

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a = 0

a > 0 or a < 0

v = 0

none of them

If speed of electron is 5 x 10⁵m/s. How long does it take one electron to transverse 1 m?

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1 x 10⁶

2 x 10⁶

2 x 10⁵

1 x 10⁵

Diameter of the atom is of the order of

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10^-10m

10^-12m

10^-15m

10^-9m

The energy of a photon is represented by

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h/c²

h/T

hc²

hf/c²

According to the special theory of relativity, time is

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absolute quantity

not absolute quantity

constant quantity

none of these

The neighbours of every molecule in crystalline solids are arranged in

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an irregular manner

a regular manner

any manner

none of them

When two waves with same frequency and constant phase difference phase difference interfere

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There is a gain of energy

There is a loss of energy

The energy is redistributed and the distribution changes with time

The energy is redistributed and the distribution remains constant with time

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