Question # 1

Water freezes at

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0oF

32oF

273 K

0 K

Which of the following material lowers friction when pushed between metal plates:

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Water

Fine marble poder

Air

Oil

Which of the substance is heaviest?

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Copper

Mercury

Aluminum

Lead

The number 275.00 consists of significant figures.

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4

3

2

5

The earth attracts us due to its __________ mass:

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Little

Zero

Small

Large

The sum of kinetic energy and potential energy of molecules or atoms is called.

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Temperature

Internal energy

Kinetic energy

Potential energy

The S.I unit of power is :

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j/s2

J

W

J/M2

The word science means.

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Intelligence

Nature

Knowledge

Philosphy

When equal opposite forces are added then the resultant force is ______________

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Double

Triple

Zero

None of these

Moon complete its one revolution around the earth is ___________ DAYS:

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29

27.3

30

21

Brownian motion is an example of.

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Linear motion

Random motion

Circular motion

Vibratory motion

Information storage devices work on the principles of

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Heat

Sound

Light

Magnetism

the power of washing machine is:

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700 W

750 W

650 W

800 W

The point through which rays of light pass after reflection from concave mirror is called principal:

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Focus

Circle

Axis

Radius

The temperature at the centre of sun is.

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10 million k

20 million k

30 million k

35 million k

It is used in satellite communication:

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Radio waves

Micro waves

Light waves

Electrical waves

If we double both the current and the voltage in a circuit while keeping its resistance constant, the power.

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remains unchanged

halves

doubles

four time

LDR can act as:

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Diode

Switch

Transistor

Rectifier

The screen of a cathode ray tube consists of a thin layer of:

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Sodium

Nitrogen

Oxygen

Phosphorus

The waves in which particles of the medium vibrate parallel to the direction of waves are called:

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Longitudinal waves

Transverse waves

Electromagnetic waves

Both a and c

Safe level of noise depends on factors:

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One

Two

Three

Four

According to Ohm's law V =________

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I²R

IR²

IR

I/R

When the amplitude of a wave become double, its energy becomes

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One half

Two times

Three times

Four times

A typical rocket consumes fuel about

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40000 Kgs-1

30000 Kgs-1

20000 Kg s-1

10000 Kgs-1

Speed of sound in vacuum is

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280 ms-1

332 ms-1

333 ms-1

Zero ms-1

Angular velocity determines, How fast or, How slow a body is

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Accelerating

Vibrating

Rotating

Oscillating

The unit of energy is same as that of

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Power

Work

Torque

Density

A diatomic gas molecules has

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Translational energy only

Rotational energy only

Vibrational energy only

All translational, Rotational and vibrational energy

Oscillation of shock absorber of a car is practical example of.

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simple harmonic motion

Forced oscillation

Damped oscillation

Undamped oscillation

Frequency range of hearing of cats is.

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20-20000 Hz

10- 10000 Hz

60-20000 Hz

60-70000 Hz

If a body of mass 5 kg is raised vertically through a distance of 1 m, then work done is.

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49 J

4.9 J

490 J

0.49 J

Multimode graded index fibre has a core whose diameter range lie from.

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5 to 50 micro meter

50 to 100 micro meter

40 to 1000 micro meter

50 to 10,000 micrometer

The curve representing an adiabatic process is called.

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An adiabatic

An isotherm

Both of these

None of these

The following gas was identified in the sun using spectroscopy

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Hydrogen

Helium

Carbon

Nitrogen

Bottom quark carries charge :

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2/3 e

-2/3 e

+1/3 e

-1 /3 e

We can find from de Broglie formula

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Wavelength

Amplitude

Speed of wave

Frequency of wave

The series in visible region is:

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Balmer series

Pfund series

Paschen series

None of above

The resistivity of --------------------decrease with the increase in temp

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Gold

Silver

Copper

Silicon

Materials can be identified by measuring their

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Mass

Half life

Both a and b

None of a,b,c

The number of neutrons in Li are

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2

3

4

7

In Helium Neon laser, discharge tube is filled with Neon gas.

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10%

15%

85%

90%

Shear modulus is expressed as:

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G = tanθ/F/A

F/A/tanθ

F/tanθ

tanθ/A

During negative half cycle of A.c then p-n junction offers.

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High resistance

Low resistance

No resistance

All of these

The induced emf in a coil is proportional to:

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Magnetic flux through the coil

Rate of change of Magnetic flux through the coil

Area of the coil

Product of magnetic flux flux and area of the coil