Chapter 10: Forces Effects - Science Mcqs for Grade 7 - Set 1

1)   The force of friction can be reduced by the help of

a. ball bearing
b. lubricants
c. cushion surfaces
d. all of them
 Answer  Explanation ANSWER: all of them Explanation: No explanation is available for this question!

2)   A force which occurs when two surfaces come in contact and slows down motion while acting in

a. opposite direction
b. same direction
c. same and opposite direction
d. both a and b
 Answer  Explanation ANSWER: same and opposite direction Explanation: No explanation is available for this question!

3)   Force can

a. speed up
b. slow down
c. stop an object
d. all of them
 Answer  Explanation ANSWER: all of them Explanation: No explanation is available for this question!

4)   Friction between moving parts of machine causes

a. heat
b. light
c. energy
d. oil
 Answer  Explanation ANSWER: heat Explanation: No explanation is available for this question!

5)   When upthrust is equal to the weight of an object, it

a. floats
b. sinks
c. moves
d. stops
 Answer  Explanation ANSWER: floats Explanation: No explanation is available for this question!

6)   The mass of a substance per unit of volume is called its

a. weight
b. density
c. volume
d. gravity
 Answer  Explanation ANSWER: density Explanation: No explanation is available for this question!

7)   There will be a great distance in stopping a vehicle which is moving

a. slowly
c. fast
d. continuously
 Answer  Explanation ANSWER: fast Explanation: No explanation is available for this question!

8)   The relationship between force, mass and acceleration is

a. F=ma
b. F=m-a
c. F=m/a
d. F=a/m
 Answer  Explanation ANSWER: F=ma Explanation: No explanation is available for this question!

9)   In order to reduce air and water resistance, objects are shaped in

a. streamline
b. oblongata
c. rectangular
d. conical
 Answer  Explanation ANSWER: streamline Explanation: No explanation is available for this question!

10)   A substance will float on surface of water if its density is less than

a. liquid
b. gas
c. both a and b
d. aqueous
 Answer  Explanation ANSWER: both a and b Explanation: No explanation is available for this question!