Question # 1

If the dot product of two non-zero vectors vanishes the vectors will be

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In the same direction

Opposite to each other

Perpendicular to each other

Zero

Two point charge +3μC and +8μC repel each other with a force of 40 N. if a charge of -5μC is added to each of them then the force between will become

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-10N

+10N

+20N

-20N

Quantity that remains unchanged in a transformer is

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Voltage

Current

Frequency

None of these

At constant volume temperature is increased then

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Collision on walls will be less

Number of collisions per unit time will increase

Collisions will be in straight lines

Collisions will not change

The essential distinction between X-rays and y-rays is that

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y-rays have smaller wavelength than X-rays

y-rays emanate from nucleus while X-rays emanate from outer part of the atom

y-rays have greater ionizing power than X-rays

y-rays are more penetrating than X-rays

The dimensional formula of toque is:

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[ML²T²]

[MLT²]

[ML^-1T^-2]

[ML^-2T^-2]

A 50-volt battery is connected across 10-ohm resistor.The current is 4.5 A.The internal resistance of the battery is

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Zero

0.5 Ω

1.1 Ω

5.0 Ω

The part of a transistor which is heavily doped to produce large number of majority carriers is

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Emitter

Base

Collector

Any of the above depending on nature of transistor.

What is the ratio of r.m.s velocity for O₂ to H₂?

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1/4

4

√4 : 1

1 : √4

The henry is the unit for

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Resistance

Magnetic flux

Magnetic field

Inductance

Choose the correct statement

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Both an ammeter and voltmeter should have small resistance

Both an ammeter and a voltmeter should have large resistance

An ammeter should have large resistance and a voltmeter should have small resistance

An ammeter should have small resistance and a voltmeter should have large resistance

In Which case does the potential energy decreases?

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On compressing a spring

On stretching a spring

One moving a body against gravitational force

One the rising of an air bubble in water

When a hydrogen atom is bombarded, the atom is excited to the n = 4 state of hydrogen atom. The energy released when the atom falls from n = 4 state to the ground state is

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1.275 eV

12.75 eV

5 eV

8 eV

A moving charge will gain energy due to the application of

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Electric field

Magnetic field

Both of these

None of these

A couple produces

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Purely linear motion

Purely rotational motion

Linear and rotational motion

No motion

Which of the following four statement is false?

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A body can have zero velocity and still be accelerated

A body can have a constant velocity and still have a varying speed

A body can have a constant speed and still have a varying velocity

The direction of the velocity of a body can change when its acceleration is constant

The number of turns in the primary coil of a transformer is 200 and the number of turns in the secondary coil is 10. If 240 volts ac are applied to the primary, the output the secondary will be

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48A

24V

12V

6V

In a Millikan's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10^-19C. The number of excess electrons on the drop is

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3.9

4

4.2

6

Two sources of sound are said to be coherent if

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They produce sounds of equal intensity

They produce sounds of equal frequency

They produce sound waves vibrating with the same phase

They produce sound waves with zero or constant phase different all instant of time

A photocell with a constant p.d. of V volt across it illuminated by a point source from a distance of 25 cm. When the source is moved to a distance of 1m, the electrons emitted by the photocell

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Carry 1/4th their previous energy

Are 1/16th as numerous as before

Are 1/4th as numerous as before

Carry 1/4th their previous momentum

A body of mass 2 kg is thrown up vertically with K.E. of 490 joules. If the acceleration due to gravity is 9.8 m/s², the height at which the K.E, of the body becomes half its original value is given by:

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50 m

12.5 m

25 m

10 m

A wire is stretched to double of its length. The strain is

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2

1

zero

0.5

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