plane mirror image formation

Post 219

Question 9 A person standing 1 m in front of a plane mirror approaches the mirror by 40 cm. The new distance between the person and his image in the plane mirror is
A) 60 cm
B) 1.2 m
C) 1.4 m
D) 2.0 m
Answer: 1.2 m
Explanation: Image fored in the plane mirror lies on the same distace on which object is lying away from the plae mirror.
Now he was standing 1 m away that is 100 cm
he walks towards plain mirror 40 cm
so the new distace b/w mirror and object is 60 cm
so the new distance bw image and object is 60 cm *2 = 120 cm that is 1.2 m.

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Cell membrane is present both in plant and animal cells

Post 218

Question 8 Which one among the following statement is correct?
A) Prokaryotic cells possess nucleus.
B) Cell membrane is present both in plant and animal cells.
C) Mitochondria and chloroplasts are no found in eukaryotic cells.
D) Ribosomes are present in eukarotic cells only.
Answer:  Cell membrane is present both in plant and animal cells.

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When hard water is evaporated completely

Post 217
Question 7 When hard water is evaporated completely, the white solid remains in the container. It may be due o the presence of
1. Carbonatesof Ca and Mg
2. Sulphates of Ca and Mg
3. Chlorides of Ca and Mg
Select the correct answer using the code given below:
A) 1 and 2 only
B) 1,2 and 3
C) 3 only
D) 1 and 3 only
Answer: B is correct.
Explanation: Hard water contains all the three substances or you can say salts of Ca and Mg.

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penetrating power of rays

Post 216
Question 5 In an observation, alpha - particles, beta-particles and gamma-rays have same energies. Their penetrating power in the givn medium in increasing order will be
A) alpha, beta, gamma
B)beta,gamma, alpha
C) alpha,gamma, beta
D) beta,alpha,gamma
Answer:  alpha, beta, gamma
Explanation: gamma is the most penetrating ray then come the beta particles which contains more penetration power than alpha particles.

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India's offshore and deep sea fish catch is very poor considering the marie potential.

Post 215

Directions: The following item consist of two statements, Statement I and Statement II. You are to examine these two statements carefullyad select the answers to these items using the code given below:

Code:
A) Both the statements are individually true and Statement II is the correct explanation of Statement I.
B) Both the statements are individually true, but statement II is not correc explanation of statement I.
C) Statement I is true, but statement II is false.
D) Statement I is false,but statement II is true.

Question 1
Statement I:
India's offshore and deep sea fish catch is very poor considering the marie potential.

Statement II:
Indian coast does not have many gulfs, bays, estuaries and backwaters.
Answer: plz commen the answer with explanation.

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