Q.1: The energy stored in a body due to its position is known as ___________ energy.
Q.2: The pulley rotates about an axle fixed to a support called __________.
Q.3: In which class of lever, do we find load between the fulcrum and the effort ?
Q.4: Which force causes the magnet to attract the iron nails ?
Q.5: Match the following:
|1. First Class Lever||i. ice-tongs|
|2. Second Class Lever||ii. bottle opener|
|3. Third Class Lever||iii. see-saw|
a) 1-i, 2-ii, 3-iii
b) 1-iii, 2-ii, 3-i
c) 1-ii, 2-iii, 3-i
Q.6: The full form of CFL is _____________________.
a) ChloroFluro Light
b) Compact Fluorescent Light
c) Compact Florence Light
Q.7: Which of the following statements are correct regarding the effects of the force ?
i) Force can change the shape of the object.
ii) Force can change the colour of the object.
iii) Force can change the direction of moving object.
iv) Force can move a stationary object.
a) i, ii, iii
b) i and iii
c) i, iii and iv
Q.8: _____________ is produced when an object starts vibrating.
a) heat energy
b) mechanical energy
c) sound energy
Q.9: Force of friction is also called force of _____________.
Q.10: Which of the following is a disadvantage of friction ?
a) It damages the tyres of vehicles.
b) It damages the soles of shoes.
Q.11: Things float on water due to the presence of _________ force.
Q.12: The fixed point on which a lever turns is called __________.
Q.13: _____________ is a machine that does a variety of tasks on command or according to instructions programmed in advance.
Q.14: Match the following:
|Simple Machine||Its Example|
|1. Inclined Plane||i. Screw jack|
|2. Wedge||ii. Blade|
|3. Screw||iii. Ramp|
a) 1-iii, 2-ii, 3-i
b) 1-ii, 2-iii, 3-i
c) 1-i, 2-iii, 3-ii