Question

1A solution turn red litmus blue its pH is likely to be

(a)1. (b)4. (c)5.(d)10

2.What happens when dilute hydrochloric acid is added to iron fillings?

(a)hydrogengasandironchlorideareproduced

(b)chlorinegasandironHydroxideareproduced

(C)noreactiontakesplace

(d)ironsaltandwaterareproduced

3.Thekidneyishumanbeingsareapartofthesystemfor

(a)nutrition(b)execration(c)respiration(d)transportation

4.Whichoneofthefollowingmaterialscannotbeusedtomakealens?

(a)Water(b)glass(c)plastic(d)clay

5.Theleastdistanceofofdistinctvisionforayoungadultwithnormalvisionisabout

(a)25m.(b)2.5cm(c)25cm(d)2.5m

6.Thechangeinfocallengthofaneyelensiscausedbytheactionofthethe

(a)pupil(b)retina(c)ciliarymuscles(d)iris

7.Whereshouldanobjectbeplacedinfrontofaconvexlenstogetarealimageofthesizeof

theobject

(a)attheprincipalfocusofthelens

(b)attwicethefocallength

(c)Atinfinity
​

Answer 1

Answer:

-A red litmus paper turns blue under basic conditions and has no effect under acidic conditions and this shows that the pH is greater than 7.

Answer 2

Answer:

1.ph < 14

2. (a)

3.excretion

4. clay

5. 25cm

6.ciliary muscles

7. (a)

Hope This Will Help You.✌️✌️

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