Question # 1

Centripetal force always acts _________ to the motion:

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Opposite

Parallel

Perpendicular

Upward

States of equilibrium are:

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2

3

4

5

Transfer of heat by the actual movement of molecules from one place to the other is called

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conduction

convection

radiation

waves

1 litre is equal to:

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10² m³

10^-3 m³

10³m³

10⁶m³

Gallium (element) melts at:

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40 °C

30 °C

80 °C

90 °C

The parallel forces which have same direction are called.

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Resutant force

Like parallel force

Unlike force

Null force

The pressure of liquid is given by

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pg V

pg A

pgh

pg

In which case it is easy for the tyre to roll over:

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Rough ground

Smooth ground

Same

None

Normal human body temperature is

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15oC

37oC

37oF

98.6oC

The S.I unit of efficiency is :

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J/s

Nm

watt

It has no unit

What should household appliances be connected in parallel with the voltage source?

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to increase the resistance of the circuit

to decrease the resistance of the circuit

to provide each appliance the same voltage as the power source

to provide each appliance the same current as the power source

Transformer Works on the principle of:

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Self induction

Mutual induction

Electro statatic

Induction

The unit of electrical energy is:

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Joule

Watt

Volt

Electron volt(eV)

According to Ohm's law V =________

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I²R

IR²

IR

I/R

Who discovered the phenomenon of natural radioactivity?

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Henry Becurial

Merry Curi

Perry

Rutherford

Astronauts is space need to communicate with each other by radio links because:

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Sound waves travel very slowly in space.

Sound waves travel very fast in speace

Sound waves cannot travel in space

Sound waves have low frequency in space

Static electricity can be generated by:

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Lubrication

Friction

Motion

Smaller the objects

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

If we double the distance between two charges, what will be the change in the force between them?

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Half

Double

One fourth

Four times

In computer terminology, proceed data is called:

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Software

Program

Information

Digital data

The Bragg's equation is given by

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The SI unit of work is

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Newton

Joule

Mol

Calorie

Angular momentum has the same unit as

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Impulse x distance

Power x time

Linear x time

work x frequency

The wavelength of X-rays is of the order of.

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10^-8 m

10^-10m

10^-5m

10^-4m

If the temperature of a gas is constant then <1/2 mv2> of the molecules of gas will be.

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Constant

Zero

Increase

Decrease

Efficiency of steam locomotive is.

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8%

10%

9%

7%

Reapters are placed in new system at distance of.

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30 km

50 km

80 km

100 km

The components of a vector which are perpendicular to each other are called

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Horizontal components

Vertical components

Rectangular components

All of these

If amplitude of a simple pendulum is increased by 4 times the time period will be.

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Four times

Half

Same

Two times

A body has P.E. = mgh, when it is at height 'h' from the ground. At the point at the distance 'x' below from the top its P.E. with

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mgh

mgx

mg(x-h)

None of these

1 kg mass will be equivalent to energy.

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9 x 10⁸ J

9 X 10¹² J

9 X 10¹⁶ J

9 X 10¹⁹ J

Resistance tolerance for gold colour is.

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50%

30%

20%

5%

Main reason for world wide use of A.C. is

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It is cheaper

Transmitted

Botha a and b

Reaches in short time

We can never accurately describes all aspects of sbatomic particles simulatanously. It is correct according to:

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Uncertainity Priciple

De-broglie Theory

Einstin Theory

Photo electric effect

The force of Neutron due to field of 10² N/C is.

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1.6 x 10^-17N

1.6 x 10^-19N

Zero

1.6 x 10^-21N

The mass of protons is:

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1.675 x 10^-27 kg

1.693 x 10^-27 kg

1.673 x 10^-31 kg

1.673 x 10^-27 kg

In current carrying long solenoid the magnetic field produced does not depend upon.

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of the above

A photo diode can turn its current ON and OFF in

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Micro seconds

Mega seconds

Nano seconds

Mili seconds

The ratio Beta in transistor is called.

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Voltage gain

Emitter gain

Current gain

Nuclear gain

The unit of resistance is:

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Ω

Ωm

Ω^-1m^-1

Ωm^-1