Question # 1

If no external force acting on a body then such system is called.

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Ideal system

Controlled system

Isolated system

None

Rooms are heated using gas heaters by

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Conduction only

Convection and radiation

Radiation only

Convection only

In which hot liquid can remains hot:

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Glass

Lead

Thermos

Hot pot

During recent years the percentage of __________ increased considerably on earth:

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Carbon dioxide

Nitrogen

Oxygen

Methane

Base / Hypotenuse is called:

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Sin𝜽

Cos 𝜽

Tan 𝜽

Cot 𝜽

If the direction of motion of the force is perpendicular to the direction of motion of the body then work done will be:

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Maximum

Minimum

Zero

None of these

Which machine is used to find acceleration due to gravity?

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Centrifuge

Atwood machine

Hydraulic machine

Washing machine

Kinetic energy is possessed by a body by:

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Virtue of motion

Height

Rest

Nil

Tan 90°=

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Infinity

1

0

0.866

Anticlockwise torque is taken:

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Negative

Neutral

Positive

Nil

The unit of force is

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Newton

m³

ms^-2

ms^-1

If Current flowing through switch then the output is expressed as:

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0

1

-1

2

If focal length of a lens is 1m, then its power will be:

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1 D

0.5 D

1.5 D

1 D

The device which is used to convert sound waves into electrical signal is called:

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Ear piece

Microphone

Transmission channel

Receiver

Static electricity can be generated by:

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Lubrication

Friction

Motion

Smaller the objects

Two charged spheres are separated by 2 mm. Which of the following would produced the greatest attractive force?

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+1 q and +4q

-1 q and -4q

+2 q and +2q

+2 q and -2q

The current used in houses is:

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A.C.

Conventiona current

Current

D.C

The mirror whose inner surface is reflecting is called:

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Concave mirror

Convex mirror

Miroor

Lens

The displacement produced in the spring directly proportional to force is called:

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Hook's law

Boyle's law

Newton's law

both 'b' and 'c'

When a body moves to and fro about a point its motion is called:

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Random motion

Linear motion

Vibratory motion

Rotatory motion

Which of the following is a method of energy transfer.

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Conduction

Reatiation

wave motion

all of these

When a uranium (92 protons) ejects a beta particle, how many protons are left in the remaining nucleus?

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92 protons

91 protons

93 protons

89 protons

Blood pressure is measured by

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Hydrometer

Barometer

Sphygmomanometer

Galvanometer

The law of conservation of mass gives us

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Equation of continuity

Stock's law

Bernoulli's equation

Viscosity

A layer of rock holding water that allows water to percolate through it with pressure is called.

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Geyeser

Aquifer

Stem vent

Hot spring

No body begins to move or comes to rest of itself was given by

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Newton

Pascal

Bernoulli

Bu Ali Sina

The horizontal component of velocity of projectile

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Increases

Decreases

Remain same

Decreases and then increases

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

An ideal heat engine can only be 100% efficient if its cold temperature reservoir is at.

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0 K

0 ^oC

100 K

100 ^oC

In vibrating string, the points where the amplitude is maximum are called.

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Nodes

Antinodes

Troughs

Crests

In S.H.M, the acceleration of the body is directly proportional to

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Weight of body

Applied force

Amplitude

Displacement

A body covers a distance of 10 m in 1 sec with a constant velocity of 10 ms-1 , Acceleration produced by the body is.

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0 ms-1

2 ms-2

5 ms-2

10 ms-2

The value of angular momentum is maximum when 0 is

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90^o

60^o

75^o

45^o

The charge on Beta particle is

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+e

-e

-2e

None of these

Kirchhoff's voltage rule is a way of stating conservation of.

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Mass

Charge

Energy

Momentum

In a certain circuit, I_{B = 40 µA,}I_C= 20 mA

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450 amp

0.45 amp

5 m amp

500 amp

The binding energy for_________ is maximum.

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Copper

Glass

Iron

Aluminum

The converses of annihilation of matter is:

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Photoelectric effect

Relativistic effect

Pair production

Compton effect

The mutual inductance between two coils depends upon their

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Size

Core material

Size, core material and separation

Separation

The direction of induced current is always so as to oppose the change which causes the current, this is the statement of

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Lenz's law

Faraday's law

Ampere's law

Coulomb's law

The process of copying is:

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Axillugraphy

Chromatography

Xerography

Spectrography

Mutual induction has a practical role in the performance of the.

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Radio choke

Transformers

A.C. Generator

D.C. Generator

The first spectral lines were discovered in 1885, were

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Paschen series

Balmer series

Pfund series

Bracket series

The activity of radioactive sample

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Is constant

Increases with time

Decreases linearly with time

Decreases exponentially with time