Question

both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion

(c) If assertion is true but reason is false

(d) If the assertion and reason both are false.

Reason: Convex mirror has positive focal length.

(i) A (ii) B (iii) C (iv) D

2. Assertion : Sodium bicarbonate is used in antacid medicines

Reason :It is a mild base which neutralizes the acidity of gastric juice

(i) A (ii) B (iii) C (iv) D

3.The composition of aqua regia is

(i) Dil hydrochloric acid :conc. Nitric acid = 3:1

(ii) Conc. Hydrochoric acid :dil nitric acid = 3:1

(iii) Conc.hydrochloric acid :conc. Nitric acid = 3:1

(iv) Dil hydrochloric acid : dil nitric acid = 3:1

4.Which colour of visible light has maximum wavelength

(i) violet (ii) blue (iii) orange (iv) red

5. Power of a lens is +1D. The type of lens is:

(b) convex lens (c) plaino concave (d) plaino convex

6. An aqueous solution turns red litmus solution blue .Excess addition of which of the following

solution would reverse the change

(i) Baking powder (ii)lime (iii) ammonium hydroxide (iv) hydrochloric acid

7. Define radius of curvature.

8. Calculate power of a lens with focal length 50 cm.

9. A solution of a substance ‘X’ is used for white washing .Name the substance ‘X’ and write its​

Answer 1

Answer:

2. A

3.iii

4. red

5. convex lens

6.iv

7. it is the radius of sphere of which sperical mirror is cut off

8. 2D

9. CaO