Question # 1

When force F makes an angle θ with the position r relative to point O, then the toque will be

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τ = 0

τ = rF cos 0

τ = rF

rF sin θ

The torque is equal to

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Rate of change of velocity

Rate of change of angular momentum

Rate of change of linear momentum

Change of linear momentum

Xerography means

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Type writing

Wet writing

Dry writing

None of these

The original source of fossil fuels is

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Geothermal

Biomass

Sun

None of these

Which one of the following gas properties of gas molecules is the same at a particular temperature

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Momentum

Speed

Mass

Kinetic Energy

If we have two vectors of magnitude 4 and 5 respectively and between them is 60°, what is magnitude of resultant

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4

8

2

3

The efficiency of half wave rectifier is:

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25.6%

1.2%

40.6%

66.6%

nuclear physics deals with

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Atom

Atomic nuclei

Elementary particles

Light

Light waves are

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Transverse waves

Longitudinal waves

Compressional wave

None of these

The acceleration of the rocket is

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a = MV/m

a = mM/V

a = mM/2V

a = mV/M

In semiconductor Si or Ge a missing electron in covalent bond from an atom is a

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Charged atom

Hole

Ion

All of them

Amorphous solids are more like

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crystalline solids

polymeric solids

glassy solids

any one of them

Which one is numeric quantity?

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Strain

Plane Angle

Impulse

both A and B

The dichronic substances are used in the process getting plane polarized light

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Selective absorption

Refraction through crystals

Reflection from different surfaces

None of these

The ability of the body to return to its original shape is called

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deformation

stretching

compressing

elasticity

The expression for the maximum height is

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Newton's third law says, that the action and reactions are

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Equal but in the same direction

Equal but in opposite direction

May be unequal but in the same direction

May be unequal but in opposite direction

The difference between C_pand C_vis equal to

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Universe gas constant

Plank's constant

Molar gas constant

Boltzmann constant

The energy of photon of wavelength 620 nm is:

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0.5 eV

1.0 eV

1.5 eV

2.0 eV

In petrol engine, the first stroke is the

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Power stroke

In take stroke

Exhaust stroke

None of these

The actual efficiency of properly tuned engine is usually not more than

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20% to 35%

25% to 30%

25% to 40%

None of these

A body of mass 5 kg is moving in a circle of radius 1 m with an angular velocity of 2 rad/s.The centripetal force is

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10 N

20 N

30 N

40 N

The whole structure obtained by the repetition of unit cell is known as

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Unit cell

Crystal lattice

Ore

All of these

The speed of a falcon in a dive is

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23 ms^-1

37 ms^-1

40 ms^-1

43 ms^-1

The unit of thermodynamic temperature scale is.

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Kelvin

Celsius

Fahrenheit

None of these

The direction of the linear momentum is the direction of

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speed

velocity

weight

none of them

The internal energy is similar to the

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Gravitational potential energy

Kinetic energy

Mechanical energy

None of these

When the car moves with increasing acceleration, the velocity time graph is a

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Straight line

Horizontal straight line

Curve

None of these

The principle of Michelson's interferometers is

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Refraction

Dispersion

Interference

Reflection

The momentum of a body is p and its kinetic energy is E its momentum become 2p its kinetic energy will be

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E/2

3E

2E

4E

Torque producing clockwise rotation is taken as

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negative

positive

zero

both negative and positive

The speed of swimming of porpoise is

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5 ms^-1

6 ms^-1

8 ms^-1

9 ms^-1

A cold soft drink is kept on the balance.When the cap is opened then the weight

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Increases

Decreases

First increases then decreases

Remains same

The cohesive forces between atoms, molecules or ions in crystalline solids maintain

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short range order

long range order

both of them

none of them

It is a common characteristic of all types of wave motion that

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Particles move up and down

Particles move back and forth

Energy is transferred without the transport of particles

A material medium transmits the disturbance

The term impulse means, the force applied on a body for

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Permanently

Temporary

Very short interval of time

None of these

When the source of light is at very large distance, the shape of wavefront is:

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Spherical

Cylindrical

Plane

None of these

A collision is an elastic collision in which

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Momentum and K.E. is conserved

Momentum is conserved and K.E. is not conserved

Momentum is not conserved and K.E. is conserved

None of these

Synthetic materials fall into the category of

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crystalline solids

amorphous

polymeric solids

all of them

In young's double slit experiment the separation between the slit is halved and distance between the slit and screen is doubled.The fringe width is

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Unchanged

Halved

Doubled

Quadrupled

Polymers have naturally combinations like with

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Oxygen

Sulphuric

Hydrocarbons

Oxygen and carbons

Angle subtended at the centre of the circle by a body is called

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Angular velocity

Linear velocity

Angular displacement

All of these

If the cover of a red book is observed in monochromatic blue light,It will appear

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White

Red

Black

Blue