WORK, FORCE AND ENERGY

Q) Select the odd one out

• A) see-saw

• B) slide

• c) crowbar

• d) scissors

Q) The given picture represents _____ force

• A) Muscular

• b) gravitational

• C) frictional

• d) all of these

Q) ________is an example of wheel and axle

• 
• 
• 
• 

Q) When the mixer grinder is switched on ,____ energy changes to ___ & _____ energy

• A) Mechanical, Sound, Heat

• B) Sound, Heat, Mechanical

• C) Electrical, Heat, Mechanical

• D) Electrical, kinetic, sound

Q) Study the given figure carefully. It will be the toughest to lift the rock when the force is applied at X, while it will be easiest to do the same when the force is applied at Y. Now, select the correct option regarding X & Y.

• A) X- a

  Y-d

• B) X- d

  Y-a

• C) X-c

  Y- b

Q) Select the correct statement

• A) Energy is capacity to do work

• B) Energy can be changed from one form to another

• C) Potential energy is the energy due to motion

• D) Both A & D.

Q) Meenal threw a pebble directly upwards. Which one of the following statements is correct regarding this?

• A) Gravity will have no effect on the pebble until it reaches its highest point

• B) Gravity will act on the pebble while it is going up as well as while it is falling down.

• C) The pebble will keep going upwards until the gravity ceases to act on it.

• D) The pebble will keep going upwards at the same speed until it reaches its highest point.

Q) A ball kept on a table falls down from the top & hits the floor with a loud noise. Which of the following shows the energy conversions that have taken place?

• A) Kinetic--> potential--> Sound

• B) Potential--> sound--> kinetic

• C) Potential--> kinetic--> sound

• D) Kinetic--> sound--> potential

Q) A toy car is released from point Y of the ramp & travels towards point X. What is/are the force(s) responsible for sliding the car towards point X?

i) Elastic force

ii) Earth's gravitational force

iii) Muscular force

• A) ii only

• B) i & ii only

• C) ii & iii only

• D) i,ii,iii

Q) Which of the following machines are the same type of simple machines as bottle opener?

• a) P& Q

• B) Q& R

• C) P&R

• D) R& S