Electricity is produced through dry cell from

Post 223

Question 15 Electricity is produced through dry cell from
A) chemical energy
B) thermal energy
C) mechanical energy
D) nuclear energy
Answer: chemical energy

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layers of atmosphere

Post 222

Question 13 Arrange he following layers of atmosphere vertically from the surface of the Earth:
1. Mesosphere
2. Troposphere
3. Stratosphere
4. Thermosphere
Select the correct answer using the code given below:
A) 1-2-3-4
B) 2-1-3-4
C) 2-3-1-4
D) 3-4-2-1
Answer: 2 - 3 - 1 - 4 (C)

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statement not true for Mammals

Post 221

Question 12 Which among the following statements is not true for mammals?

A) They possess hair on the body.
B) Some of the lay eggs.
C) Their heart is three chambered.
D) Some are aquatic.

Answer: Their heart is three chambered.This statement is incorrect.

Explanation: Mammals are four chambered heart organisms.

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Ocean current on Map

Post 220

Question 10 Match list I with List II and select the correct aswer using the code give below the Lists:
List I (Ocean current)
A) Guinea Current
B) Oyashio Current
C) Canaries Current
D) Kuroshio Current

Answer: A- 2, B - 3, C-1,D-4 so answer is B

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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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