COMMON PHYSICAL OBSERVATIONS (MCQs)

The weight of an object is due to:

• (A) The net force acting on it
• (B) The total of all forces acting on it irrespective of their directions
• (C) The force that it exerts on the ground
• (D) Its insert property

The direction of the acceleration in uniform motion is along the:

• (A) Direction of motion
• (B) Direction of velocity
• (C) Tangent to the circle at the point of observation
• (D) Direction perpendicular to velocity

If the axis of earth were not tilted, there would have been:

• (A) No different seasons
• (B) Days and nights of equal duration
• (C) Both (A & B)
• (D) Nights of longer direction

A man is ordering a lens to use reading glass. He should order a large:

• (A) Convex lens with short focal length
• (B) Convex lens with long focal length
• (C) Concave lens with short focal length
• (D) Concave lens with long focal length

Weightlessness experienced while orbiting the earth in a spaceship is the result of:

• (A) Acceleration
• (B) Intertia
• (C) Zero gravity
• (D) Center of gravity

A man carrying a bucket of water in his left hand leans:

• (A) Backward
• (B) Forward
• (C) Towards his left hand
• (D) Towards his right hand

A corked bottle full of water when frozen will break because:

• (A) The bottle contains on freezing
• (B) Glass is a bad conductor of heat
• (C) The volume of water increases on freezing
• (D) The volume of water decreases on freezing

Thermosflask keeps a liquid hot because:

• (A) It has silver coated walls
• (B) It has double walls
• (C) Heat losses by condition and radiation are largely prevented
• (D) Air between the double walls is removed

A glass tumbler breaks when hot liquid is suddenly poured into it because of:

• (A) Uneven expansion
• (B) Poor workmanship
• (C) Bad material used
• (D) Liquid being very hot

We prefer white clothes in summer because:

• (A) They are easily washable
• (B) They look very clean
• (C) They reflect heat away
• (D) They are symbol of wisdom