Tag: physics

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

A stretched spring possesses:

  1. kinetic energy

  2. elastic potential energy

  3. electric energy

  4. magnetic energy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Elastic potential energy is Potential energy stored as a result of deformation of an elastic object, such as the stretching of a spring. It is equal to the work done to stretch the spring, which depends upon the spring constant k as well as the distance stretched.

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

The energy required to raise a given volume of water from a well can be

  1. Mega watts

  2. Mega newton

  3. Mega joules

  4. Kilo watts
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

unit of energy is joule.

so energy required for raising water from the well is also in joule or kilo joule or mega joule.
watt is unit of energy per unit time and  newton is unit of force.
so best option is option C.
Also 1 Mega joule $=10\times10^6$ joule.

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

A cricket ball of mass 300 g is bowled towards a batsman with a speed of $\displaystyle 180\quad km\quad { h }^{ -1 }$. The batsman hits the ball such that it bounces back with the same speed. If the force exerted by the bat on the ball is 3000 N, find the duration of the impact is ____ s.

  1. 1

  2. 0.01

  3. 0.1

  4. 0.04
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Change in momentum = F * t. Initial velocity = 180 km/h = 50 m/s. Final velocity = -50 m/s. Change in momentum = m * (vf - vi) = 0.3 kg * (-50 - 50) = -30 kg m/s. Magnitude = 30. t = 30 / 3000 = 0.01 s.

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

The type of energy utilised by humans and animals to carry out their daily life activities is ________ .

  1. wind energy

  2. geothermal energy

  3. biochemical energy

  4. hydro energy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Biochemical energy comes under biochemistry which is a study of chemical processes within and relating to living organisms. By controlling information flow through biochemical signaling and flow of chemical energy through metabolism, biochemical processes involves in day to day activities.
Hence biochemical energy is utilised by humans for carrying daliy activities.
Multiple choice physics the essence of change forms of energy and energy conservation energy for everything forms of energy

The energy stored in a torch cell is :

  1. Light energy

  2. Electrical energy

  3. Chemical energy

  4. Potential energy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The torch cell makes use of redox reaction to store energy in the form of chemical energy. This chemical energy is then converted to electrical energy and finally to light energy as the bulb glows.


Hence, correct answer is option $C$

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

The energy that helps in burning of wood is :

  1. Chemical

  2. Electrical

  3. Potential

  4. Muscular
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the case of burning wood, stored chemical energy in the log is released due to heating by other excited atoms. This chemical reaction is called combustion and requires oxygen. Combustion changes the chemical energy into heat and light energy.


Hence, correct answer is option $A$

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

An electric heater converts electrical energy into

  1. Chemical energy

  2. Heat energy

  3. Light energy

  4. Muscular energy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An electric heater is an electrical device that converts electrical energy into heat energy. The heating elements inside electric heater is an electrical converter and works on the principle of joule heating. An electric current passing through resistor converts electrical energy into heat energy.

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

The energy present in petrol is :

  1. Chemical

  2. Kinetic

  3. Potential

  4. Heat
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 chemical energy is the potential of a chemical substance to undergo a transformation through a chemical reaction to transform other chemical substances.

kinetic energy is due to motion.
potential energy is due to relative position.
heat energy is due to temperature.
in petrol different different reaction occurs which provide energy to run the engine, so energy possessed in petrol is chemical energy.
option A.

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

The muscular energy required by our body is given to us by :

  1. Air

  2. Water

  3. Oxygen

  4. Food
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

chemical energy is the potential of a chemical substance to undergo a transformation through a chemical reaction to transform other chemical substances.

In food different different reaction occurs which provide energy to run the body, so energy possessed in food is chemical energy and which is converted to muscular energy required to run our body.
so option D.

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

The energy stored in food is :

  1. Electrical

  2. Heat

  3. Chemical

  4. Muscular
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 chemical energy is the potential of a chemical substance to undergo a transformation through a chemical reaction to transform other chemical substances.

heat energy is due to temperature.
in food different different reaction occurs which provide energy to run the body, so energy possessed in food is chemical energy.
option C.