Question

1. Which of the following is a physical change?

(a) Formation of curd from milk

(b) Ripening of fruits

(c) Getting salt from sea water

(d) Burning of wood

2. What is the formula of plaster of p?

(a) CaSO4.2H₂O

(c) CaSO4

3. The Composition of aqua- régia is -

(a) Dil HCl: Dil HNO3

(b) Conc HC1: Dil HNO3

(c) Conc HCI: Conc HNO3

(b) Dil HCI: Dil HNO3

(3: 1)

(3:1)

(3:1)

(3:1)

4. Focal length of a plane mirror is -

(a) Zero

(c) 25 cm

(b) CaSO4.1/2H₂0

(d) CuSO₁

(b) Infinite

(d) -25

5. The opening & closing of stomata is regulated by

(a) Turgidity of guard cells

(b) Availability of solar radiations

(c) Biological clock of plants

(d) Concentration of atmospheric CO2​

Answer 1

Answer:

1. c

2. caso4. 1/2 h2o

3.c.

4.b. infinite

5.a.

Explanation:

you can go for all the above answers.

hope this will help