Chapter 8: Turning Effect of Forces Physics Mcqs for High School - Grade 9 - Set 6

1)   For a right angle triangle if base is 4 cm and perpendicular is 3 cm then cosθ is equal to

a. 0.9
b. 0.8
c. 0.3
d. 1
Answer  Explanation 

ANSWER: 0.8

Explanation:
No explanation is available for this question!


2)   The number of perpendicular components of a force are

a. 1
b. 2
c. 3
d. 4
Answer  Explanation 

ANSWER: 2

Explanation:
No explanation is available for this question!


3)   When the resultant torque acting on a body is zero, then the body satisfies

a. 2nd condition for equilibrium
b. third condition for equilibrium
c. no equilibrium state
d. first condition for equilibrium
Answer  Explanation 

ANSWER: 2nd condition for equilibrium

Explanation:
No explanation is available for this question!


4)   Two children sitting on a see saw are not swinging, the net torque is

a. greater than 1
b. less than 1
c. zero
d. infinite
Answer  Explanation 

ANSWER: zero

Explanation:
No explanation is available for this question!


5)   If a body remains in its new position when disturbed from its previous position, then it is said to be in the state of

a. stable equilibrium
b. unstable equilibrium
c. neutral equilibrium
d. zero equilibrium
Answer  Explanation 

ANSWER: neutral equilibrium

Explanation:
No explanation is available for this question!


6)   To lower their center of mass, circus artists use

a. short poles
b. long poles
c. heavy costumes
d. light costumes
Answer  Explanation 

ANSWER: long poles

Explanation:
No explanation is available for this question!


7)   Torque is turning effect of

a. force
b. moment of force
c. line of action of force
d. frictional force
Answer  Explanation 

ANSWER: force

Explanation:
No explanation is available for this question!


8)   A couple is produced by

a. one unlike parallel force
b. two unlike parallel forces
c. like parallel force
d. two alike parallel force
Answer  Explanation 

ANSWER: two unlike parallel forces

Explanation:
No explanation is available for this question!


9)   The sum of two or more forces is called

a. resultant forces
b. like parallel forces
c. unlike forces
d. positive forces
Answer  Explanation 

ANSWER: resultant forces

Explanation:
No explanation is available for this question!


10)   If the sum of clockwise momentum is equal to sum of anti-clockwise momentum then body is in

a. zero gravity
b. balanced
c. imbalanced
d. non equilibrium
Answer  Explanation 

ANSWER: balanced

Explanation:
No explanation is available for this question!


11)   The point of a system where an applied force causes the system to move without rotation is termed as

a. friction
b. center of gravity
c. center of a mass
d. intersection point
Answer  Explanation 

ANSWER: center of a mass

Explanation:
No explanation is available for this question!


12)   If A and B are the end points of a spanner and force applied is F, then the torque of the couple is equal to

a. F - AB
b. F&frac; AB
c. F × AB
d. F + AB
Answer  Explanation 

ANSWER: F × AB

Explanation:
No explanation is available for this question!