Tag: physics

Questions Related to physics

The form of energy stored in kerosene is :

physics the essence of change forms of energy and energy conservation energy for everything forms of energy

  1. Chemical

  2. Heat energy

  3. Magnetic

  4. Mechanical

Show answer
Correct Option: A
Explanation:

When kerosene burns its hydrocarbons react with oxygen and produces heat and light energy, so some chemical enwrgy is stored in the kerosene because energy can neither b created nor b destroyed.

So best option is option A.

When you climb a staircase, you spend______ energy and gain ____energy.

physics the essence of change forms of energy and energy conservation energy for everything forms of energy

  1. Kinetic - potential

  2. Chemical - electrical

  3. Muscular - kinetic

  4. Muscular - potential

Show answer
Correct Option: D
Explanation:

When someone climb staircase then he has to do so physical work, so some muscular energy is spemt, also if his relative position wrt earth chamges so some gain in kinetic energy of the body, body was initial at rest amd finaly at rest so no kinetic energy is gained or lost.

So best possible answer is option D.

Which of the following may no be conserved for an isolated system 

physics the essence of change forms of energy and energy conservation energy for everything forms of energy

  1. Energy

  2. Potential energy

  3. Mechanical energy

  4. Kinetic energy

Show answer
Correct Option: B,C,D
Explanation:

In an isolated system only $T.E$ is conserved $M.E$ can not be conserved in case of inelastic collision$.$ Some energy is converted into heat$.$ and sum of $P.E,K.E$ and lost energy remains const$.$

Hence,
option $b,c,d$ is correct answer.

Muscular energy is form of chemical energy. 

physics the essence of change forms of energy and energy conservation energy for everything forms of energy

  1. True

  2. False

Show answer
Correct Option: A

What energy does the person possess while climbing a hill?

physics the essence of change forms of energy and energy conservation energy for everything forms of energy

  1. Potential Energy

  2. Kinetic Energy

  3. Only muscular energy

  4. Both (A) and (B)

Show answer
Correct Option: D
Explanation:

Both potential energy (due to going up against the force of gravity) and kinetic energy (because of movement of the body).

A fish swimming in water possess mechanical energy.

physics the essence of change forms of energy and energy conservation energy for everything forms of energy

  1. True

  2. False

Show answer
Correct Option: A

Energy stored in the bonds of molecules is a form of:

physics the essence of change forms of energy and energy conservation energy for everything forms of energy

  1. heat energy

  2. potential energy'

  3. chemical energy

  4. light energy

Show answer
Correct Option: C
Explanation:

The Energy that gets released when the bonds are formed was stored in the electromagnetic fields inside of the atom. When the bond is formed, the electrons and protons assume a configuration that has an, overall, less intense combination of electric and magnetic fields inside of the bonded atoms than when they were separate. 

A body $A$ is placed on a railway platform and an identical body $B$ in a moving train. Which of the following energies of $B$ are greater than those of $A$ as seen from the ground?

physics the essence of change forms of energy and energy conservation energy for everything forms of energy

  1. Kinetic

  2. Total

  3. Mechanical

  4. Internal

Show answer
Correct Option: A,B,C
Explanation:

Since the body B is in a moving train, it will have higher kinetic energy as compared to the body on platfrom. It is because the speed of the body $A$ is zero.

The total energy of the body $B$ will be more than body $A$ due to its state of motion and the mechanical energy of the body $B$ will be higher due to more amount of work done on it as it is moving.

The internal energy of the two identical bodies do not depend on other external factors and it remains constant for the bodies.

So, only the internal energy will not change.

The commonly used barometric liquid in a barometer is Mercury.

physics pressure in liquids and gases common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

commonly used barometer to measure pressure is filled with mercury such that 1 atm = 76 cm of Hg .

so option (A) is correct .

________ is an instrument used to measure the atmospheric pressure.

physics pressure in liquids and gases common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

  1. Barometer

  2. Calorimeter

  3. Thermometer

  4. Speedometer

Show answer
Correct Option: A
Explanation:

Barometer is the instrument used to measure atmospheric pressure.

calorimeter and thermometer is used to measure temperatture.
speedometer is used to measure the speed of the vehicles.
so option (A) is correct