Metal resistors that conduct in accordance with Ohm’s law are said to be?

1 Mark(s)

Ohmmeter

Ohms component

Ohmic

Omega

Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?

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Water, iron and air

Iron, air and water

Air, water and iron

Iron, water and air

What is the correct sequence in which the lengths of the following units increase?
1. Angstrom
2. Micron
3. Nanometer
Select the correct answer using the codes given below:

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1, 2, 3

3, 1, 2

1, 3, 2

2, 3, 1

The lead wires should have

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Smaller diameter and high resistance

Larger diameter and low resistance

Smaller diameter and low resistance

Larger diameter and high resistance

If a liquid is heated in space under no gravity, the transfer of heat will take place by process of

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Conduction

Convection

Radiation

Cannot be heated in the absence of gravity

A fluorescent tube is preferred to an electric bulb because

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It has a larger light emitting surface

Voltage fluctuations do not affect it

In a tube electrical energy is almost converted
into light

None of these

A certain current on passing through a galvanometer produces a deflection of 100 divisions. When a shunt of one ohm is connected, the deflection reduces to 1 division. The galvanometer resistance is

1 Mark(s)

100 W

99 W

10 W

9.9 W

A prism having refractive index 1.414 and refracting angle 30° has one of the refracting surfaces silvered. A beam of light incident on the other refracting surface will retrace its path, if the angle of incidence is ______.

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45°

60°

30°

0°

Consider the following statements :
(1) A light and a heavy body, having equal momenta, have equal kinetic energies.
(2) The total energy of a body in motion is equal to the work it can do in being brought to rest.
(3) A body cannot have momentum when its energy is zero.
Which of these statement(s) is/are correct ?

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1 and 2

2 and 3

Only 2

Only 3

The maximum current that can be measured.by a galvenometer of resistance 400 is 10 mA. It is converted into a voltmeter that can read upto 50 V. The resistance to be connected in series with the galvanometer is (in ohm).

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4050

4960

2010

5040

The weight of the body is given by?

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W = mv

W = mg

W = ms

W = ma

Light year is a unit of

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Time

Light

Distance

Intensity of light

Magnetism at the centre of a bar magnet is

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Minimum

Maximum

Zero

Minimum or maximum

A motorboat covers a given distance in 6 hours moving downstream on a river. It covers the same distance in 10 hours moving upstream. The time it takes to cover the same distance in still water is ______.

1 Mark(s)

6.5 hours

8 hours

9hours

7.5 hours

The following observations were taken for determining surface tensiton T of water by capillary method :
Diameter of capilary, D = 1.25 × 10–2 m rise of water, h = 1.45 × 10–2 m Using g = 9.80 m/s2 and the simplified relation T = rhg × 103 N/m, the possible error in surface 2
tension is closest to :

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0.024

0.1

0.0015

0.015

A body of mass 4 kg is accelerated upon by a constant force, travels a distance of 5 m in the first second and a distance of 2 m in the third second. The force acting on the body is

1 Mark(s)

2N

4N

6N

8N

Geo-stationary satellite

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Moves faster than a near earth satellite

Has a time period less than that of the earth’s satellite

Revolves about the polar axis

Is stationary in the space

If the earth is 1/4th of its present distance from the sun, the duration of the year would be

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1/4 of the present year

1/6 of the present year

1/16 of the present year

1/8 of the present year

In a thermocouple?

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Heat energy is converted into mechanical energy

Chemical energy is converted into electrical energy

Mechanical energy is converted into heat energy

Heat energy is converted into electrical energy

If the wire of uniform area of cross-section is cut into two equal parts, the resistivity of each parts will be?

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Doubled

Halved

Remain the same

Four times

Which of the following properties is not possible in case of X-rays?

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Interference

Diffraction

Polarisation

All of the above

An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is

1 Mark(s)

1200 m

0.33 km

3.33 km

33 km

Consider the following statements:
A body weighs less at the equator than at the poles because:
1. earth rotates about its axis.
2. the ice cap at the poles increases gravitational pull.
3. equatorial diameter is greater than the polar diameter.
4. of some unknown facts.
Which of the statements given above is/are incorrect?

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1 and 3 only

1 and 4 only

2, 3 and 4

1, 3 and 4

Cp and Cv are specific heats at constant pressure and constant volume respectively. It is observed that Cp – Cv = a for hydrogen gas Cp – Cv = b for nitrogen gas
The correct relation between a and b is :

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a = 14 b

a = 28 b

1/14b

a = b

Blue colour of sea water is due to

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Interference of sunlight reflected from the water surface

Scattering of sunlight by the water molecules

Image of sky in water

Refraction of sunlight

Planets do not twinkle because

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They emit light of a constant intensity

Their distance from the earth does not change with time

They are very far away from the earth resulting in decrease in intensity of light

Hey are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable

The angle between centripetal acceleration and tangential acceleration is?

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180°

90°

0°

45°

If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same

1 Mark(s)

Velocity

Momentum

Acceleration

Kinetic energy

If an electric circuit could be compared to a water circuit at a water park, then the current would be analogous to the ____.

1 Mark(s)

Water pressure

Gallons of water flowing down slide per minute

Water

Bottom of the slide

he value of the following is given by 100 (kilo ampere ) x ( micro ampere ) 100 milli ampere * 10 ampere

1 Mark(s)

0.1 A

0.001 A

10A.

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