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Answered on 29/07/2020 CBSE/Class 8/Science/Reproduction in Animals

Indicate whether the following statements are True (T) or False (F). (a) Oviparous animals give birth... read more

Indicate whether the following statements are True (T) or False (F).

(a) Oviparous animals give birth to young ones. ( )

(b) Each sperm is a single cell. ( )

(c) External fertilization takes place in frogs. ( )

(d) A new human individual develops from a cell called gamete. ( )

(e) Egg laid after fertilization is made up of a single cell. ( )

(f) Amoeba reproduces by budding. ( )

(g) Fertilization is necessary even in asexual reproduction. ( )

(h) Binary fission is a method of asexual reproduction. ( )

(i) A zygote is formed as a result of fertilization. ( )

(j) An embryo is made up of a single cell. ( ) read less

Shobana S.

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(a) false (b) true (c) true (d) false (e) true (f) false (g) false (h) true (i) true (j) false
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Answered on 28/07/2020 CBSE/Class 8/Science/Reaching The Age of Adolescence

Choose the correct option. (a) Adolescents should be careful about what they eat, because? (i) proper... read more

Choose the correct option.

(a) Adolescents should be careful about what they eat, because?

(i) proper diet develops their brains.

(ii) proper diet is needed for the rapid growth taking place in their body.

(iii) adolescents feel hungry all the time.

(iv) taste buds are well developed in teenagers.

(b) Reproductive age in women starts when their?

(i) menstruation starts.

(ii) breasts start developing.

(iii) body weight increases.

(iv) height increases.

(c) The right meal for adolescents consists of?

(i) chips, noodles, coke.

(ii) chapatti, dal, vegetables.

(iii) rice, noodles and burger.

(iv) vegetable cutlets, chips and lemon drink. read less

Shobana S.

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(a) (ii) (b) (i) (c) (ii)
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Answered on 28/07/2020 CBSE/Class 8/Science/Friction

Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor.... read more
Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces inincreasing order will be

(a) wet marble floor, dry marble floor, newspaper and towel.

(b) newspaper, towel, dry marble floor, wet marble floor.

(c) towel, newspaper, dry marble floor, wet marble floor

(d) wet marble floor, dry marble floor, towel, newspaper read less

Shobana S.

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OPTION A
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Answered on 29/07/2020 CBSE/Class 8/Science/Friction

Explain why sliding friction is less than static friction?

Shobana S.

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When an object starts moving from the state of rest, it is called static friction. The force required to keep the object moving with the same speed is called sliding friction. When the box starts sliding, the contact points on its surface do not get enough time to lock into the contact points on the... read more

When an object starts moving from the state of rest, it is called static friction.

The force required to keep the object moving with the same speed is called sliding friction.

When the box starts sliding, the contact points on its surface do not get enough time to lock into the contact points on the floor. So sliding friction is less than static friction.

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Answered on 28/07/2020 CBSE/Class 8/Science/Friction

Give examples to show that friction is both a friend and a foe?

Shobana S.

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If there is no friction, then it is not possible to stop the vehicles/ automobiles on the road to avoid accidents. It wears out materials such as screws, ball bearings, and soles of shoes. So, the friction is both a friend and a foe.
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Answered on 29/07/2020 CBSE/Class 8/Science/Friction

Explain why objects moving in fluids must have special shapes?

Shobana S.

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When objects are moving in fluids, they have to overcome the friction acting on them. They lose energy. To minimise friction, they must have unique shapes. unique shapes make the objects to move in fluids in an easier way
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Answered on 28/07/2020 CBSE/Class 8/Science/Chemical effects of Electric Current

In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for... read more
In case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this? read less

Shobana S.

Personalized coaching for MATHS, SCIENCE,HINDI subjects.

Small amounts of mineral salts are present in the water. So when it comes into contact with the electrical supply, it will become a good conductor of electricity which will ultimately lead to electrical shock. So they shut off the main electrical supply for the area.
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Answered on 28/07/2020 CBSE/Class 8/Science/Chemical effects of Electric Current

A child staying in a coastal region tests the drinking water and also the seawater with his tester. He... read more
A child staying in a coastal region tests the drinking water and also the seawater with his tester. He finds that the compass needle deflects more in the case of seawater. Can you explain the reason? read less

Shobana S.

Personalized coaching for MATHS, SCIENCE,HINDI subjects.

Distilled water is free from impurities and mineral salts. So it is a bad conductor of electricity. Seawater contains a lot of mineral salts in it. So it is a good conductor or electricity. It is the main reason that the compass needle deflects more in the case of seawater.
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Answered on 29/07/2020 CBSE/Class 8/Science/Chemical effects of Electric Current

Paheli had heard that rain water is as good as distilled water. So, she collected some rain water in... read more
Paheli had heard that rain water is as good as distilled water. So, she collected some rain water in a clean glass tumbler and tested it using a tester. To her surprise, she found that the compass needle showed deflection. What could be the reasons? read less

Shobana S.

Personalized coaching for MATHS, SCIENCE,HINDI subjects.

Rainwater also contains some natural mineral salts in ti.so this is the reason that the compass needle showed deflection.
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Answered on 29/07/2020 CBSE/Class 8/Science/Chemical effects of Electric Current

Prepare a list of objects around you that are electroplated

Shobana S.

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Chromium plating is done in kitchen gas burners, bath taps. Jewellery makes electroplate on silver and gold on less expensive materials.
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