7th Class Science Work and energy Question Bank

done Work and energy

• A) Displacement

B) Speed

C) Velocity

D) Acceleration

• A) $N{{m}^{2}}$

B) $kg\,m/{{s}^{2}}$

C) $1Nm$

D) ${{N}^{2}}{{m}^{2}}$

• A) 4 J

B) 25 J

C) 15 J

D) 100 J

• A) Energy is capacity to do work

B) Work can be expressed as force$\times$displacement

C) Unit of work done is joule

D) Unit of energy is Newton

• A) Electrical energy

B) Mechanical energy

C) Chemical energy

D) Heat energy

• A) Force

B) displacement

C) Energy

D) Velocity

• A) Dyne

B) erg

C) Newton

D) Joule

• A) Force

B) displacement

C) Energy

D) None of these

• A) ${{10}^{7}}$

B) $\text{1}{{0}^{\text{5}}}$

C) $\text{1}{{0}^{\text{4}}}$

D) $\text{1}{{0}^{\text{9}}}$

• A) light energy

B) heat energy

C) chemical energy

D) potential energy

• A) heat energy

B) sound energy

C) light energy

D) chemical energy

• A) battery

B) washing machine

C) fen

D) Refrigerator

• A) bulb

B) electric geyser

C) electric motor

D) burning of fuel

• A) electrical energy to chemical energy

B) electrical energy to mechanical energy

C) chemical energy to sound energy

D) mechanical energy to electrical energy

• A) force

B) work

C) temperature

D) Velocity

• A) kinetic energy

B) potential energy

C) chemical energy

D) light energy

• A) 13.6 J

B) 27 J

C) 4.5 J

D) 54 J

• A) electric bell

B) battery

C) refrigerator

D) electric bulb

• A) chemical energy into heat energy

B) heat energy into chemical energy

C) heat energy into electrical energy

D) electric energy into heat energy

• A) positive work

B) negative work

C) zero work

D) None of these

• A) potential energy

B) kinetic energy

C) electrical energy

D) sound energy

• A) increases

B) first increases then decreases

C) decreases

D) remains constant

• A) joule

B) dyne

C) erg

D) Newton

• A) negative

B) positive

C) zero

D) none of these

• A) Nuclear

B) mechanical

C) Heat

D) Sound

• A) very little work

B) lot of work

C) no work

D) cannot say

• A) moon

B) wind

C) sun

D) Fire

• A) work

B) force

C) pressure

D) Acceleration

• A) Force and displacement are in the same direction

B) More than one force is acting on the object

C) Displacement and force are in opposite directions

D) Both (b) and (c)

• A) Pressure

B) Energy

C) Force

D) Displacement

• A) potential energy

B) kinetic energy

C) chemical energy

D) heat energy

• A) zero

B) positive

C) negative

D) None of the above

•  Column-I Column-II (A) Electric motor (p) Electrical energy to heat energy (B) Automobile engine (q) Electrical energy to mechanical energy (C) Electric heater (r) Light energy to electrical energy (D) Photocell (s) Heat energy to mechanical energy

A) A$\to$ (q), B$\to$ (s), C$\to$ (p), D$\to$ (r)

B) A$\to$ (r), B$\to$ (p), C$\to$ (s), D$\to$ (q)

C) A$\to$ (p), B$\to$ (q), C$\to$ (r), D$\to$ (s)

D) A$\to$ (s), B$\to$ (r), C$\to$ (q), D$\to$ (p)

•  Column-I Column-II (A) Work (p) $\frac{1}{2}m{{v}^{2}}$ (B) Energy (q) vibrations (C) Kinetic energy (r) can be positive, negative or zero (D) Sound energy (s) ability to do work

A) A$\to$ (q), B$\to$ (s), C$\to$ (p), D$\to$ (r)

B) A$\to$ (s), B$\to$ (r), C$\to$ (q), D$\to$ (p)

C) A$\to$ (r), B$\to$ (s), C$\to$ (p), D$\to$ (q)

D) A$\to$ (r), B$\to$ (s), C$\to$ (q), D$\to$ (p)

•  Column-I Column-II (A) Potential energy (p) mgh (B) Work (q) can never be created or destroyed (C) 1 joule (r) $\text{f }\!\!\times\!\!\text{ d}$ (D) Energy (s) $\text{1}{{\text{0}}^{\text{7}}}$erg

A) A$\to$ (r), B$\to$ (s), C$\to$ (p), D$\to$ (q)

B) A$\to$ (p), B$\to$ (r), C$\to$ (q), D$\to$ (s)

C) A$\to$ (q), B$\to$ (s), C$\to$ (p), D$\to$ (r)

D) A$\to$ (p), B$\to$ (r), C$\to$ (s), D$\to$ (q)

• A) A

B) B

C) C

D) D

• A) A

B) B

C) C

D) D

• A) A

B) B

C) C

D) None of these

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Statement (1) is correct while statement (2) is incorrect.

B) Statement (2) is correct while statement (1) is incorrect.

C) Both statements are correct

D) Both statements are incorrect.

• A) Statement (1) is correct while statement (2) is incorrect.

B) Statement (2) is correct while statement (1) is incorrect.

C) Both statements are correct

D) Both statements are incorrect.

• A) Statement (1) is correct while statement (2) is incorrect.

B) Statement (2) is correct while statement (1) is incorrect.

C) Both statements are correct

D) Both statements are incorrect.

• A) reducing the input force

B) reducing the box's mass

C) increasing the amount of work done

D) increasing the distance the box is lifted

• A) A

B) B

C) C

D) All three have same energy

• A) A only

B) C only

C) A, B and D only

D) A and B only

• A) A

B) B

C) C

D) D

• A) kinetic energy$\to$heat energy$\to$ gravitational potential energy

B) chemical potential energy$\to$kinetic energy$\to$gravitational potential energy

C) gravitational potential energy$\to$kinetic energy$\to$chemical potential energy

D) gravitational potential energy$\to$kinetic energy$\to$gravitational potential energy

• A) negative work

B) positive but not maximum work '

C) no work at all

D) maximum work

• A) double

B) 4 times

C) half

D) 1/4times

• A) 2:5

B) 7:5

C) 4:25

D) 25:4

• A) energy can be created or destroyed

B) energy can never be created or destroyed

C) cannot be transformed from one form to another form

D) Both (b) and (c)

• A) 79 J

B) 5 J

C) 16 J

D) 395 J

• A) 320 J

B) 640 J

C) 5 J

D) 10 J

• A) are standing

B) are sitting on a chair

C) are sitting on the ground

D) lie down on the ground

• A) no energy

B) electrical energy

C) potential energy

D) kinetic energy

• A) 400kg

B) 1250kg

C) 200kg

D) 2500kg

• A) Object P

B) Object Q

C) Both objects will possess same energy

D) None of these

• A) Positive

B) Negative

C) Zero

D) 15joule

• A) 7.2 J

B) 72 J

C) 7200 J

D) 720 J

• A) 3m

B) 9m

C) 6m

D) 12m

• A) positive

B) negative

C) zero

D) none of these

• A) more than object B

B) less than object B

C) Same as B

D) Cannot say

• A) Heat to kinetic

B) Kinetic to heat

C) Kinetic to potential

D) Potential to heat

• A) only the potential energy goes on increasing

B) only the kinetic energy goes on increasing

C) both kinetic energy as well as potential energy go on increasing

D) the kinetic energy goes on increasing while potential energy goes on decreasing

• A) 10 J

B) 90 J

C) 180 J

D) 270 J

• A) a nail is plugged into a wooden board

B) a box is pushed along a horizontal floor

C) there is no component of force parallel to the direction of motion

D) there is no component of force normal to the direction of force

• A) only positive

B) only negative

C) both positive and negative

D) None of these

• A) Zero

B) Positive

C) Negative

D) Depends on the particular situation

• A) K.E. only

B) P.E. only

C) neither K.E. nor P.E.

D) both K.E. and P.E.

• A) chemical energy during photosynthesis

B) heat energy in drying food grains

C) electrical energy in solar cells

D) All of these

• A) The law of conservation of energy is violated

B) Potential energy gets converted into kinetic energy progressively

C) Sum of Potential Energy and Kinetic Energy at any point during the free fall remains constant

D) Both (b) and (c)

•  Column - I Column - II (A) Electric iron (p) Electrical energy to light energy (B) Washing machine (q) Electrical energy to heat energy (C) Solar cell (r) Electrical energy to mechanical energy (D) CFL (s) Light energy to electrical energy

A) A$\to$ (r), B$\to$ (s), C$\to$ (p), D$\to$ (r)

B) A$\to$ (p), B$\to$ (r), C$\to$ (s), D$\to$ (q)

C) A$\to$ (q), B$\to$ (r), C$\to$ (s), D$\to$ (p)

D) A$\to$ (q), B$\to$ (s), C$\to$ (p), D$\to$ (r)

•  Column - I Column - II (A) a car is moving in the direction of force (p) zero work (B) A boy is studying in his classroom (q) negative work (C) Rising up of an object against force of gravity (r) Potential energy (D) Water stored in tank on the roof (s) Positive work

A) A$\to$ (s), B$\to$ (p), C$\to$ (q), D$\to$ (r)

B) A$\to$ (r), B$\to$ (s), C$\to$ (q), D$\to$ (p)

C) A$\to$ (p), B$\to$ (r), C$\to$ (s), D$\to$ (q)

D) A$\to$ (q), B$\to$ (p), C$\to$ (r), D$\to$ (s)

•  Column - I Column - II (A) Energy due to motion (p) Potential energy (B) Energy due to position (q) Kinetic energy (C) Energy stored in battery (r) Chemical energy (D) Energy between two charge particles at rest (s) Electrostatic energy

A) A$\to$ (q), B$\to$ (p), C$\to$ (s), D$\to$ (r)

B) A$\to$ (q), B$\to$ (p), C$\to$ (r), D$\to$ (s)

C) A$\to$ (p), B$\to$ (q), C$\to$ (r), D$\to$ (s)

D) A$\to$ (q), B$\to$ (r), C$\to$ (p), D$\to$ (s)

• A) increases by decreasing the radius of the circle

B) decreases by increasing the radius of the circle

C) increases by increasing the mass of the body

D) is always zero

• A) No

B) Yes, sometimes

C) Yes, always

D) Cannot be decided

• A) Car P only

B) Cars P and Q only

C) Cars R and S only

D) All the cars have equal potential energy

• A) None of the cars have kinetic energy

B) All the cars have equal kinetic energy

C) Cars P and Q have more kinetic energy than cars R and S.

D) Cars Q and Shave more kinetic energy than cars P and R.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Both A and R are true and R is the correct explanation of A.

B) Both A and R are true but R is not the correct explanation of A.

C) A is true but R is false.

D) A is false but R is true.

• A) Statement (1) and (3) are incorrect while statement (2) is correct.

B) Statement (1) and (2) are incorrect while (3) is correct.

C) All the statements are correct.

D) All the statements are incorrect.

• A) Statement (1) and (3) are incorrect while statement (2) is correct.

B) Statement (1) and (2) are incorrect while (3) is correct.

C) All the statements are correct.

D) All the statements are incorrect.

• A) Statement (1) and (3) are incorrect while statement (2) is correct.

B) Statement (1) and (2) are incorrect while (3) is correct.

C) All the statements are correct.

D) All the statements are incorrect.

•  Energy at point P Energy at point Q A kinetic kinetic B kinetic potential C potential kinetic D potential potential

A) A

B) B

C) C

D) D

• A) at position 1

B) at position 2

C) the first time at position 3

D) the last time at position 3

• A) less than

B) more than

C) equal to

D) zero, equal to

• A) Heat Light Kinetic Sound

B) Kinetic Heat Sound Light

C) Kinetic Sound Light Heat

D) Sound Kinetic Heat Light

• A) 4J

B) 8J

C) 6J

D) 12J

• A) 4:5

B) 5:4

C) 2:5

D) 4:10

• A)

B)

C)

D)

• A) greater in condition 1

B) greater in condition 2

C) same in condition 1 and 2

D) cannot say

• A) greater for chalk box

B) greater for ball

C) same for both chalk box and ball

D) cannot say

• A) Electrical energy $\to$ kinetic energy + light energy + heat energy

B) Kinetic energy $\to$ chemical potential energy $\to$ light energy

C) Kinetic energy $\to$ electrical energy $\to$ light energy + heat energy

D) Chemical potential energy $\to$ electrical energy$\to$light energy

• A) they are equal in mass

B) they are losing kinetic energy

C) they are made of different materials

D) they do not have any stored energy