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CBSE VIII Science Set - 6

Question 1

Two unlike charges are separated by a certain distance. The force acting between them is an example for ____.
A) contact force, which is a push
B) contact force, which is a pull
C) non-contact force, which is a push
D) non-contact force, which is a pull

Question 2

A stone lying on the ground does not move even though it is being pushed by Jack and Jill. Jack says that the friction between the stone and the ground is equal to the force applied by them.
A) True
B) False

Question 3

When we pluck the string of an instrument, like the sitar, the sound that we hear is only due to the vibrations of the string.
A) True
B) False

Question 4

To give rich look to decorative articles, less expensive metals are electroplated on more expensive metals.
A) True
B) False

Question 5

An object is placed in the fourth square in front of a plane mirror, which is placed on a chess board. The image of the object is formed behind the plane mirror in the ____ square from the plane mirror.
A) eighth
B) sixth
C) fourth
D) second

Question 6

Ropes made of nylon and ____ are commonly used in cranes and elevators because of their high elasticity and tensile strength.
A) polyester
B) rayon
C) acrylic
D) spandex

Question 7

Which of the following gases is used in hospitals, to be given to patients undergoing major surgical operations and to those who have difficulty in breathing?
A) Nitrogen
B) Oxygen
C) Hydrogen
D) Carbon dioxide

Question 8

Blue colour of the flame is used by a goldsmith to melt gold because ____.
A) it does not spoil gold
B) it has least carbon content due to complete combustion
C) it has least effect on the quality of the gold
D) it has maximum temperature needed for melting of the gold

Question 9

Which of the following is preserved by sugar?
A) Amla
B) Squash
C) Pickles
D) Mangoes

Question 10

Cells having nuclear material without nuclear membrane are referred as prokaryotes.
A) True
B) False