Force And Pressure(8th Grade > Physics ) Questions and Answers
Explanation:-
Answer: Option A. -> Gases exert pressure.:
A
Gases exert pressure on the walls of the container they are stored in. This pressure changes the shape of the balloon causing it to inflate.
Explanation:-
Answer: Option B. -> False:
B
A contact forces requires physical contact between bodies for the force to act. Magnetic and electrostatic forces can be applied on a body without actually touching it. Thus, the given statement is false.
Explanation:-
Answer: Option B. -> The surface having more surface area experiences more force.:
B
According to formula PressureP=Force(F)Area(A)
or F=P×A.
So, for the same amount of pressure P,if we increase the surface area Aof an object,force experienced by thatobject is increased.
Explanation:-
Answer: Option A. -> True:
A
The pressure exerted by the atmosphere iscalled atmospheric pressure. Inside the body, the flowing blood and body fluids createa pressure which counters the effect of atmospheric pressure. Therefore, we don't feel atmospheric pressure and arenot crushed by it.
Explanation:-
Answer: Option C. -> height of the liquid column:
C
The pressure exerted by a liquid depends on:
- density of the liquid
- acceleration due to gravity
- height of the liquid column
It doesn't depend on area or shape of the liquid surface; nor on volume of the liquid.
Explanation:-
Answer: Option D. -> 1 Pa:
D
Given:
Force on the bodyF=5N
Surface area of the bodyA=5m2
Now, pressure applied on the body P=FA
P=5N5m2=1Nm−2=1Pa
Pressure applied on thebody =1Pa
Explanation:-
Answer: Option B. -> False:
B
If a net force isapplied on anobject moving with some speed,in the direction of its motion, its speed increases. For example, for a ball dropped from a roof, direction of motion and direction of force are in the downward direction. The speed of the ball keeps increasing until it hits the ground.