Question

11. Assertion (A): The jiggling of the grains of food color in hot water is more

when compared to the jiggling in cold water.

Reason (R): The average kinetic energy of the molecules is directly

proportional to the absolute temperature.

Which of the following is correct ( )

A) A is true, R is correct explanation for A

B) A is true, R is not the correct explanation for A

C) A is false, R is true D) A is false, R is false

12. The storage food spoils, due to ( )

i) Rusting ii) Reduction iii) Oxidation iv) Rancidity

A) iv B) I, ii C) iii, iv D) i

13. The colour of copper changes to ____ colour due to corrosion ( )

A) Red B) Green C) Blue D) Black

14. The following reaction is an example for ______ reaction ( )

2AgBr → 2Ag + Br2↑

A) Thermal decomposition B) Photolytic decomposition

C) Electrolytic decomposition D) Double displacement

15. Match the following ( )

i) Sweet shop ( ) P) Concave mirror

ii) ENT doctor ( ) Q) Plane mirror

iii) Vehicles ( ) R) convex mirror

A) i-Q, ii-P, iii-R B) i-P, ii-Q, iii-R

C) i-Q, ii-R, iii-P D) i-R, ii-P, iii-Q

16. The mixture of backing soda, tartaric acid with weak edible oil is called as ( )

A) Tartaric mixture B) Baking powder

C) Crystalline mixture D) Antacid

17. Benzene and Rock salt having refractive indices 1.50 and 1.54 respectively

then the speed of light is more in ____ ( )

A) Benzene B) Rock salt

C) Both media same speed D) Can’t say

18. Total internal reflection takes place in optical fibre because of ( )

A) Small radius of fibre B) Length of fibre

C) Width of fibre D) Large radius of fibre

Answer 1

b is the answer its easy be smart comeon