Question

1)Name one metal which does not react with dilute hydrochloric acid.
2)Why we do not sense any pain when we cut nails and hair?

3)Which hormone balances the proportion of salts in the blood?

4)The fungus that is commonly used in bakery and beverage industries is(a) Penicillium (b) Yeast(c) Agaricus (d) Rhizopus

5)Non-metals are(a) generally gases (b) generally liquids(c) generally solids (d) generally solid and gasses

6)How much percentage of carbon is present in bituminous?(a) 20 – 25%(b) 25 – 35%(c) 65 – 85%(d) 98%

7)Animals exhibiting external fertilization produce a large number of gametes. Pick the appropriate reason from the following (a) The animals are small in size and want to produce more offspring’s.(b) Food is available in plenty in water.(c) To ensure better chance of fertilization.(d) Water promotes production of large number of gametes.

8)A spring balance is used for measuring(a) mass (b) weight(c) pressure (d) speed

9)Which of the following is not a smooth surface?(a) Surface of wet soap (b) Surface of tyres(c) Glazed tiles (d) Surface of mirror

10. A pendulum oscillates 20 times in 4 seconds. Find its time period. (a) 0.05 sec (b) 0.001 sec. (c) 0.2 sec (d) 0.1 sec

11. If you hold a pen in your right hand and stand in front of the mirror, the pen will be in the left hand in the image. This phenomenon is called (a) lateral inversion (b) diffraction (c) reflection (d) inversion ​

Answer 1

Answer:

1. copper

2. because they r dead cells

3. insulin

4. yeast

5. d option

9. surface of tyres

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Answer 2

Answer:

2- because nails and hair are dead cells