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The World of The Living

Multiple Choice Questions

81.

The joint between the head and the upper jaw is an example of

pelvic joint
fixed joint
ball and socket joint
hinged joint

82.

There are two planets in our solar system whose periods of revolution around the Sun are less than those of our Earth, but their periods of rotation are more as compared to those of the Earth. These planets are

Mars and Jupiter
Mercury and Saturn
Mercury and Venus
Uranus and Neptune

83.

Which one of the following places in India is most likely to be affected by cyclones?

Udaipur
Badrinath
Puri
Amritsar

84.

The air near a heat source gets hot and rises. The air from the sides comes into taking its place. This is the way in which the air gets heated by oil heaters. What is this process called?

Convection
Radiation
Diffusion
Conduction

85.

A book is lying at rest on the surface of a table. Which one of the following statements is true about the force (s) acting on it?

There is a pair of balanced forces acting on it
Only gravitational force is acting on it
Only frictional force is acting on it
There is no force acting on it

86.
Read the given statements and select the correct option.

The husk is separated from heavier seeds of grain by winnowing.

The difference in the size of particles in a mixture is utilised to separate them by the process of sieving and filtration.

Statement Bis true and Statement A is false

Both Statements A and B are false

Both Statements A and Bare true

Statement A is true and Statement Bis false

Both Statements A and Bare true

Both statements A and Bare true. In winnowing heavier and lighter components of a mixture are separated by wind or blowing air e.g; Husk is separated from the heavier seed. In sieving and filtration difference in the size of particles is utilized to separate them from each other e.g; a mixture of sugar and wheat flour, clear water, and mud.