CG Board Class 6 Science Work Energy and Machines MCQ
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When is no work done, even if a force is applied?
a) When the force is applied perpendicular to the direction of motion
b) When the force is applied in the opposite direction to the motion
c) When there is no displacement of the body
d) All of the above
Answer: c) When there is no displacement of the body
Which of the following is the unit of work and energy?
a) Newton
b) Kilogram
c) Meter
d) Joule
Answer: d) Joule
Which of the following is an example of work done by heat energy?
a) Boiling water
b) Lifting an object
c) Lighting a bulb
d) Both a and c
Answer: a) Boiling water
If a 5 Newton force is applied to move a table by 2 meters, what is the work done?
a) 2.5 Joules
b) 5 Joules
c) 10 Joules
d) 25 Joules
Answer: c) 10 Joules
According to the principle of energy conservation, which of the following is true?
a) Energy can be created
b) Energy can be destroyed
c) Energy can be converted from one form to another
d) Energy can be both created and destroyed
Answer: c) Energy can be converted from one form to another
When a candle is lit, what happens?
a) The chemical energy in the candle is converted into light energy
b) The chemical energy in the candle is converted into heat energy
c) The chemical energy in the candle is converted into both light and heat energy
d) None of the above
Answer: c) The chemical energy in the candle is converted into both light and heat energy
In a hydroelectric power plant, how is electricity generated?
a) The potential energy of water in the dam is converted into kinetic energy
b) The kinetic energy of water is converted into mechanical energy
c) The mechanical energy is converted into electrical energy
d) All of the above
Answer: d) All of the above
What is the main purpose of using machines?
a) To apply force at a convenient point
b) To change the direction of force
c) To lift heavy weights with smaller forces
d) All of the above
Answer: d) All of the above
Which of the following is not a simple machine?
a) Lever
b) Inclined plane
c) Wedge
d) Gear
Answer: d) Gear
In a lever of the first kind, where is the fulcrum located?
a) Between the load and the effort
b) Between the fulcrum and the effort
c) Between the fulcrum and the load
d) None of the above
Answer: a) Between the load and the effort
Which of the following is an example of a lever of the first kind?
a) Scissors
b) Bottle opener
c) Fishing rod
d) Cart
Answer: a) Scissors
In a lever of the second kind, where is the load located?
a) Between the fulcrum and the effort
b) Between the load and the effort
c) Between the fulcrum and the load
d) None of the above
Answer: a) Between the fulcrum and the effort
Which of the following is an example of a lever of the second kind?
a) Forceps
b) Seesaw
c) Cart
d) Fishing rod
Answer: c) Cart
In a lever of the third kind, where is the effort located?
a) Between the fulcrum and the load
b) Between the load and the effort
c) Between the fulcrum and the effort
d) None of the above
Answer: b) Between the load and the effort
Which of the following is an example of a lever of the third kind?
a) Scissors
b) Cart
c) Forceps
d) Bottle opener
Answer: c) Forceps
What is the main purpose of an inclined plane?
a) To apply force at a convenient point
b) To change the direction of force
c) To lift heavy objects with less effort
d) To increase the speed of work
Answer: c) To lift heavy objects with less effort
