Question # 1

An object with a mass 5 kg moves at constatn velocity of 10 ms-1 A constant force then acts for 5 seconds on the object and gives it a velocity of 2 ms-1. In the opposite direction ,The force acting on the objects is.

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-12 N

5 N

-10 N

-15 N

0.2 mm in units of meters is.

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2 x 10⁴ m

0.0002 m

0.002 m

None of these

Two rods with length 12.321vm snf 10.3 cm are placed side by side. the difference is their lengths is.

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2.02 cm

2 cm

2.021 cm

2.0 cm

Which of following prefeix represents largest value.

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Pico

Peta

Mega

Kilo

The numbers having one significance digit is.

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6.0

1.1

6 x 10²

7.1

A particle of mass m moving with a velocity v collides with another particle of the same mass at rest. The velocity of the first particle after collision is.

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0

v

-p

- 1/2

Which one of the followig unit is not a derived unit.

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Kilogram

Watt

Newton

Pascal

A car is moving with velocity of 10 m/s . If it has acceleration of 2 m/s2 for 10 seconds. What is final vlocity of the car.

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20 m/s

10 m/s

30 m/s

15 m/s

Volume of water consumed by you per day is estimated in.

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Cubic metre

Litre

Mililitre

Kilogram

The instrument best measures the internal diameter of a pipe is.

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Screw gauge

Metre rule

Vernier caliper

Measuring tape

In 5 s a car accelerates so that its velocity increases by 20 m/s. The acceleration is

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0.25 m/s2

4 m/s2

100 m/s2

25 m/s2

What does the term e-mail stand for?

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Emergency mail

Electronic mail

extra mail

external mail

For the emission of electrons from the tungsten filament the values of current and voltage are taken as:

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0.1 A and 2V

0.2 A and 4V

0.3A and 6V

0.4A and 8V

Which form of energy is sound?

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Electrical

Mechanical

Thermal

Chemical

In the presence of a charged body, an insulated conductor develops positive charge at one end and negative charge at the other end, this i- called:

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Electrostatics

Electrostatic induction

Magnetism

Electromagnetic induction

The value of acceleration is simple harmonic motion at mean position is:

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Maximum

Zero

10 N

Both a and b

The instrument which is used to display the magnitude of changing electric current is called:

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Evacuated tube

Cathode rays oscilloscope

Television tube

Picture tube

Which is the unit of energy:

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KWh

Electron volt

Joule

All of above

Information storage device work on the principles of:

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Heat

Sound

Light

Magnetism

The mirror whose inner surface is reflecting is called:

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Concave mirror

Convex mirror

Miroor

Lens

The half life of plutonium²³⁶Pu₉₄is:

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2.00 years

2.35 years

2.79 years

2.85 years

The brain of any computer system is:

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Monitor

Memory

CPU

Control unit

The ability of reveal the minor details of an object under examination is called.

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Resolving power

Magnification

Scattering

Reflection

The optical fibre is covered for protection by

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Glass jacket

Plastic jacket

Steel jacket

Diamond jacket

The direction of angular velocity of along the

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Tangent at that point

Axis of rotation

Radius towards the centre

Radius away from the centre

Fringe spacing in Young's double slit experiment increases due to increase in.

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Slit separation

Wave length

Order of Fringe

Frequency of source

A direction of torque is

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Along the position vector r

Perpendicular to both r and f

Along the direction of force F

Opposite to the direction of r

Speed of sound in vacuum is

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280 ms-1

332 ms-1

333 ms-1

Zero ms-1

If the time period of simple pendulum is 2 seconds its frequency will be.

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1 Hz

0.5 Hz

1.5 Hz

2 Hz

When a vector is multiplied by a (-)ve number its direction

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Remains constant

Reversed

Change by 90°

None of these

10 N and 20 N are acting on a body of mass 2 kg the minimum acceleration will be.

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10 ms-2

20 ms-2

60 ms-2

5 ms-2

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Original source of energy for biomass is

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Earth

Star

Moon

Sun

One electron volt is equal to.

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1.6 x 10^-19 Joule

1.6 x 10^-19Coulomb

1.6 x 10^-12N

1.6 x 10¹⁸Joule

The activity of radioactive sample

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Is constant

Increases with time

Decreases linearly with time

Decreases exponentially with time

A wire stretched to double of its length, its strain is:

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2

1

0

0.5

Force on a charged particle is zero when projected at angle with magnetic field.

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0 ^o

90^o

180^o

270^o

Conversation of only one half of A.C. into D.C. is called.

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Half wave amplification

Wave amplification

Half wave electrification

Half wave rectification

The SI unit of magnetic permeability is.

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WbA-1m-1

Wbm-2

WbmA-1

WbAm-1

The most useful tracer is.

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Strontium -90

Iodine -31

Cobalt -60

Carbon -14

The expression P = VI hold only when current and voltage are.

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In phase

Out of phase

At right angle to each other

At angle of 120 ^o

When a motor is over loaded then the magnitude of back emf.

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Increases

Decreases

Remain constant

Zero

The motional emf developed in a conduction depends upon.

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Length

Orientation

Magnetic field

All of the above

Presence of dielectric between two charges always.

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Reduces the electric force

Enhance the electric force

Does not effect electric force

Double the electric force