10 COMMON QUESTION ON PHYSICS

Question 1

The wire having a green plastic covering is a _____?

  Line wire

  Neutral wire

  Earth wire

  None of these

It's 'Earth wire '
The earth wire is a crucial part of the home electrical system and is designed to protect against electric shock.

Question 2

A liquid drop tends to assume a spherical shape because of_____?

  Surface tension

  Viscous force

  Gravitational force

  Elastic force

It's 'Surface tension '
Surface tension is responsible for the shape of liquid droplets. Droplets of water tend to be pulled into a spherical shape by the imbalance in cohesive forces of the surface layer.

Question 3

Earliest thermometer was developed by

  Celsius

  Fahrenheit

  Kelvin

  Galileo Galilei

It's 'Galileo Galilei '
In about 1593, Galileo Galilei invented a rudimentary water thermoscope, which for the first time, allowed temperature variations to be measured. Today, Galileo's invention is called the Galileo Thermometer.

Question 4

Which of the following is not the unit of energy?

  Calorie

  Joule

  Electron Volt

  Watt

It's 'Watt '
The watt is a derived unit of power in the International System of Units (SI), named after the Scottish engineer James Watt (1736–1819). The unit is defined as joule per second and can be used to express the rate of energy conversion or transfer with respect to time.

Question 5

Decibel is the unit of _______.

  Speed of light

  Intensity of sound

  Intensity of heat

  None of these

It's 'Intensity of sound '
Decibel (dB) unit for expressing the ratio between two amounts of electric or acoustic power for measuring the relative loudness of sounds.

Question 6

Law of electrolysis is given by_______.

  Faraday

  Maxwell

  Lenz

  Bohar

It's 'Faraday '
Law of electrolysis is given by Faraday.

Question 7

X- rays are ________waves.

  Longitudinal

  Transverse

  Electromagnetic

  Elastic

It's 'Electromagnetic '
X-rays are a form of electromagnetic radiation as are radio waves.

Question 8

Definition of force comes from Newton’s ____________?

  First law of motion

  Second law of motion

  Third law of motion

  Law of gravitation

It's 'Second law of motion '
Newton’s Second law: The vector sum of the external forces F on an object is equal to the mass ‘m’ of that object multiplied by the acceleration vector ‘a’ of the object: F = ma.

Question 9

A typical example of a semiconductor is _______?

  platinum

  germanium

  quartz

  Mica

It's 'germanium '
Germanium is a chemical element with symbol Ge and atomic number 32. It is a lustrous, hard, grayish-white metalloid in the carbon group, Purified germanium is a semiconductor.

Question 10

Magnetism at the centre of a bar magnet is _______.

  high

  maximum

  around- zero

  minimum or maximum

It's 'around- zero '
As the middle the magnetic lines are far away from one another and at the poles are close to each other that is why at the center the magnetic force is less than the poles.