Que : 146. Choose and write the correct alternative :

(i) What happens when dilute hydrochloric acid is added to iron filling?

(a) Hydrogen gas and iron chloride are produced

(b) Chlorine gas and iron hydroxide are produced

(c) No reaction takes place

(d) Iron salt and water are produced


(ii) The most reactive metal is -

(a) Na

(b) Au

(c) Ag

(d) Cu


(iii) Asexual reproduction through small buds takes place in -

(a) Amoeba

(b) Yeast

(c) Plasmodium

(d) Leishmania


(iv) Which of the following is not a part of the female reproductive system human beings?

(a) Ovary

(b) Uterus

(c) Vas deferens

(d) Fallopian tube


(v) SI unit of power of lens is -

(a) Meter

(b) Centimeter

(c) Diopter

(d) Millimeter


(vi) The human eye forms the image of an object at its -

(a) Cornea

(b) Iris

(c) Pupil

(d) Retina


(vii) The change in focal length of an eye lens is caused by the action of the -

(a) Pupil

(b) Retina

(c) Cilliary muscles

(d) Iris


(viii) Fossil fuel is -

(a) Coal and petroleum

(b) Wood

(c) Paper

(d) Plastic

Answer:

(i) (a) Hydrogen gas and iron chloride are produced

(ii) (a) Na

(iii) (b) Yeast

(iv) (c) Vas deferens

(v) (c) Diopter

(vi) (d) Retina

(vii)  (c) Cilliary muscles

(viii) (a) Coal and petroleum