Question # 1

The force with which Earth attracts the object towards its center is known as

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Force

Weight

Mass

Gravity

_____________ can neither be created nor be destroyed.

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Light

Force

Energy

Weight

A Leslie cube is use to identify :

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Radiation

Conduction

Convection

Both A and B

The forces that are parallel to each other and have the same direction are called:

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Like parallel forces

Unlike parallel forces

Resultant forces

Net forces

The altitude of geostationary orbits in which communication satellites are launched above the surface of the Earth is

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850 km

1000 km

6400 km

42,300 km

The formula of heat capacity is:

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mc

mc𝜟𝜽

mc𝜟Q/𝜟T

None of these

A force of 10 N is making an angle of 30o with the horizontal. Its horizontal component will be

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4N

5N

7N

8.7N

Metals are good conductor of heat dut to the:

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Free electron

Big size of their molecule

Small size of their molecules

Rapid vibrations of their atoms

1 Pa is equal to

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NM

NM-1

JS

NM-2

The unit of momentum is:

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kgms^-2

kgms^-1

Ns^-1

None of these

The maximum value of friction is:

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Kinetic friction

Static friction

Limiting friction

Dynamic friction

The output of a NAND gate is 0 when

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Both of its inputs are 0

Both of its inputs are 1

any of its inputs is 0

any of its inputs is 1

the number of waves passing through a point in one second is called:

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time period

cycle

frequency

amplitude

The time period of frequency and time period is equal to:

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v

1

0

λ

In medical field, C.R.O is used to display:

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Heart beats

Pictures of organs

Pictures of bones

Blood pressure

The rating of a fuse wire is always expressed in:

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ampere-hours

KWh

Volts

Amperes

To hear echo, the distance between the observer and the obstacle is 17m then how much distance will the sound travel?

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60m

54m

17m

34m

Which one is a safety device?

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Switch

Fuse

Circuit breaker

Both B and C

Sound waves having frequency lower than 20 Hz are called:

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Ultrasonic

Infrasonic

Audible

Echo

When a potential of 10 volt is applied across a conductor, a current of 5 miliampere flows through it, the resistance of the conductor will be:

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200 ohm

2000 ohm

0.2 ohm

0.002 ohm

Resistance of a wire of conductor of 2 Ω resistance is doubled:

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4 Ω

6 Ω

8 Ω

10 Ω

The phenomenon in which radiations convert the matter into positive and negative ions is called:

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Radio activity

Excitation

Ionization

Electrolysis

A device based upon the thermodynamics property of matter is called.

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Calorimeter

Heat engine

thermometer

Voltmeter

The error in speed of sound calculated by Newton at STP is about.

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0 %

14 %

15 %

16 %

Sound travel faster in

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CO2

H2

O2

He

Blood has density equal to that of

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Mercury

Sodium

Honey

Water

When meta I is heated sufficiently electrons are given off by the metal. This phenomenon is known as.

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Photoelectric effect

Piezo electric effect

Thermionic emission

Secondary emission

How many neutrons are there in the nuclide Zn⁶⁶?

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22

30

36

66

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

The special theory of relativity based on.

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One postulate

Two postulates

Three postulates

Four postulates

One use of a single p-n junction semiconductor in an electrical circuit is a

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Rectifier

Transistor

Battery

Diode

Shunt resistance is

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Low resistance

Zero resistance

High resistance

Impedance

The first atomic reactor was introduced by

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Currie

Enrico Fermi

Newton

Bohr

Lenz's law presented in

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1834

1934

1826

1836

The unit of Plank's constant 'h' is.

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JC

J/C

JS

J/S

Write the SI unit of magnetic flux.

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Tesla

Weber

Weber m-2

Tesla m2

When transistor are used in digital circuits they usually operate in the :

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Active region

Break down region

Saturation & cutoff regions

Linear region

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