arrow_back CBSE Class - 8 Science Online Practice Tests

CBSE VIII Science Set - 5

Question 1

A small hole is made at the bottom of a vessel. The speed with which water comes out of the hole depends on the height of the water column.
A) True
B) False

Question 2

The force needed to put an object at rest into motion is Fs. The force needed to move the same body with uniform velocity is Fk. The relation between the two forces is ____.
A) Fs < Fk
B) Fs = Fk
C) Fs > Fk
D) Fs = 2Fk

Question 3

A wave completes 24 cycles in 0.8 second. The frequency of the wave is ____ Hz.
A) 30
B) 8
C) 24
D) 12

Question 4

The name of the scientist who showed that when electrodes were immersed in water, and a current was passed, bubbles of oxygen and hydrogen were produced, is ____.
A) Neil Armb
B) Louis Braille
C) William Nicholson
D) Ian Wilmut

Question 5

A ray is incident on a plane mirror such that the angle between the incident ray and the normal to the mirror at the point of incidence is 35o. The angle between the reflected ray and the mirror is ____.
A) 35o
B) 90o
C) 55o
D) 180o

Question 6

Plastics can be decomposed by bacteria.
A) True
B) False

Question 7

Which of the following gases is used for providing an inert atmosphere for canned food?
A) Oxygen
B) Nitrogen
C) Hydrogen
D) Carbon dioxide

Question 8

If a lit match is brought a little above the candle wick immediately the candle has been blown out, it is noticed that the flame from the match jumps the gap and re-ignites the wick.
A) True
B) False

Question 9

Which of the following bacteria perform the process of nitrification?
A) Nitrogen fixing bacteria
B) Ammonifying bacteria
C) Nitrifying bacteria
D) Denitrifying bacteria

Question 10

Which of the following cell organelles is known as the kitchen of a cell?
A) Mitochondria
B) Golgi apparatus
C) Chloroplast
D) Lysosome