Deck 7: Chemistry, Physics and Units in the SI System

Question 1

The soap can be hardened by

A)adding sodium carbonate or sodium silicate during its manufacture
B)adding sodium chloride
C)adding potassium hydroxide
D)adding animal fat and coconut oil

Answer 1

adding sodium carbonate or sodium silicate during its manufacture

Question 2

Bleaching powder is

A)CaO₂Cl
B)CaOCl2
C)CaClO₂
D)CaCl₂⁺O₂

Answer 2

CaOCl2

Question 3

Plaster of Paris is obtained by heating

A)gypsum
B)limestone
C)sodium carbonate
D)calcium sulphate

Answer 3

gypsum

Question 4

The common name of sodium bicarbonate is

A)lime
B)baking powder
C)baking soda
D)washing soda

Question 5

Slaked lime reacts with chlorine to give

A)baking soda
B)washing soda
C)bleaching powder
D)cement

Question 6

The main constituent of cement is

A)SiO₂
B)CaO
C)CaSO₄
D)Al2O₃

Question 7

The real bleaching agent present in bleaching powder is

A)chlorine
B)oxygen
C)oxygen.
D)CaO

Question 8

Cake does not taste bitter due to presence of

A)sodium carbonate
B)tartaric acid
C)citric acid
D)sugar

Question 9

What is obtained on adding lime to H₂O?

A)lime
B)limestone
C)slaked lime
D)quicklime

Question 10

Which of the following is different from others?

A)speed
B)density
C)force
D)time

Question 11

The amount of substance in the SI system of units is represented by

A)candela
B)mole
C)weight
D)kilogram

Question 12

The SI unit of temperature is

A)Kelvin
B)second
C)mole
D)candela

Question 13

The National Physical Laboratory is situated at

A)Kolkata
B)New Delhi
C)Bombay
D)None of these

Question 14

The SI unit of electric current is

A)ampere
B)candela
C)mole
D)none of these

Question 15

How many fundamental units are present in the SI system of units?

A)5
B)6
C)7
D)3

Question 16

Which of the following physical quantities is different from others?

A)speed
B)distance
C)energy
D)average velocity

Question 17

The unit for the rate of change of velocity will be

A)m/s
B)m/s²
C)Ns
D)N/s

Question 18

The velocity of a body at rest is always

A)unity
B)negative
C)zero
D)infinite

Question 19

Impulse is

A)a scalar quantity
B)a vector quantity
C)neither a scalar nor a vector
D)sometimes a scalar and sometimes a vector

Question 20

The weight of a body would not be zero

A)at the centre of the earth
B)during a free fall
C)in interplanetary space
D)on a frictionless surface

Question 21

A man is standing on a boat in still water. If he walks towards the shore the boat will

A)move away from the shore
B)remain stationary
C)move towards the shore
D)sink

Question 22

If action and reaction were to act on the same body,

A)the resultant would be zero
B)the body would not move at all
C)both (a) and (b) are correct
D)neither (a) nor (b) is correct

Question 23

The combined effect of mass and velocity is taken into account by a physical quantity called

A)torque
B)moment of force
C)momentum
D)moment of momentum

Question 24

Momentum is a measure of

A)weight
B)mass
C)quantity of motion
D)velocity

Question 25

A rocket works on the

A)first law of motion
B)second law of motion
C)third law of motion
D)law of conservation of energy