WORKSHEET Class -8
Chapter 11
A. Tick the correct option.
1. Atmospheric pressure is measured with the help of a:
a. Barometer b. Thermometer
c. Hydrometer d. Anemometer
2. The pressure of liquids at different depths is measured by:
a. Barometer b. Hydrometer
c. Manometer d. Anemometer
3. Force per unit area is:
a. Buoyant b. Force
c. Pressure d. Thrust
4. Unit of pressure is:
a. Hz b. N
c. Pa d. Kg/m2
5. Pressure from atmospheric air is __________ kg per sq. cm.
a. One b. Two
c. Three d. Four
B. Fill in the blanks with the correct options:
i. Liquid pressure ______________ with depth (increases/decreases).
ii. 1 Pascal is equal to ______________ newton per square metre (one/two).
iii. Total force acting vertically on the surface of a body is ______________
(thrust/pressure).
iv. Air pressure ______________ as one goes higher and higher (increases/decreases).
v. Liquid pressure ______________ on the shape of the container
(depends/does not depend).
C. Match the following and write down the numbers of correct pairs.
Column A Column B
Instrument Function
i. Sphygmomanometer a. Atmospheric pressure ii Barometer b. Liquid pressure
iii. Manometer c. Blood pressure
iv. Pascal d. Force per unit area
v. Pressure e. Unit of pressure
A. Tick the correct option.
1. Which of the following is a contact force?
a. Gravitational b. Frictional
c. Magnetic d. Electrostatic
2. Which of the following forces helps in reducing air pollution?
a. Muscular b. Mechanical
c. Magnetic d. Electrostatic
3. The unit of measuring weight is:
a. Ka b. Pa
c. N d. g
4. The direction of the force of friction is always __________ to the direction of motion.
a. Parallel b. Perpendicular
c. Same d. Opposite
5. A spring balance is used to measure:
a. Weight b. Speed
c. Force d. Pressure
B. Fill in the blanks with the correct options:
Help Box: non-contact force, force, gravitational force, mass, push or pull
i. The amount of matter in a body is __________________
ii. Force which is applied without direct contact __________________
iii. Water flows downwards due to __________________
iv. Force could be a __________________ or a __________________
v. _________________ is responsible for the change in the state of motion of objects.
C. Match the following.
Column A Column B
i. Frictional Force a. Fruit falling from a tree
ii. Gravitational Force b. Iron filings attracted
iii. Magnetic Force c. A child carrying school bag
iv. Muscular Force d. Shirt collar is torn
v. Electrostatic Force e. Bits of paper are raised
D. Identify the force .
i. A man carrying a sac on his back. __________________________
ii. A woman squeezing a cloth. __________________________
iii. Fruit falling on the ground. __________________________
iv. A balloon stuck with the wall. __________________________
v. Iron nails attracted toward magnet. __________________________
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