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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

List changes in the body that take place at puberty?

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- Breast begin to develop for girls. - Boys facial hair, moustache, beard. - Both boys and girls hair grow underarms in the region above the thigh or the pubic area. read more

- Breast begin to develop for girls.

- Boys facial hair, moustache, beard.

- Both boys and girls hair grow underarms in the region above the thigh or the pubic area.

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

Explain why sportsmen use shoes with spikes?

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To get a better grip on the floor to avoid falling, athletes use shoes with spikes.
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Answered on 29/07/2020 CBSE/Class 8/Science/Friction

Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will... read more
Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why? read less

Shobana S.

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It is mainly due to the force of friction. Force of friction acts opposite to the applied force. Since the box pushed by Seema is heavy, she has to use more force to overcome the force of friction.
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Answered on 29/07/2020 CBSE/Class 8/Science/Friction

Explain why sliding friction is less than static friction?

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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 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

The bulb does not glow in the setup shown in Fig. 14.10. List the possible reasons. Explain your answer? read more

The bulb does not glow in the setup shown in Fig. 14.10. List the possible reasons. Explain your answer?

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Shobana S.

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If the current through the circuit is weak, then the filament does not get heated sufficiently, and it does not glow. Though the material may conduct efficiently, it may not conduct as a metal. As a result, even though the circuit is complete, it may not get sufficient current to glow. The solution is... read more

If the current through the circuit is weak, then the filament does not get heated sufficiently, and it does not glow. Though the material may conduct efficiently, it may not conduct as a metal. As a result, even though the circuit is complete, it may not get sufficient current to glow. The solution is non conducting.

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Answered on 28/07/2020 CBSE/Class 8/Science/Chemical effects of Electric Current

A tester is used to check the conduction of electricity through two liquids, labelled A and B. It... read more

A tester is used to check the conduction of electricity through two liquids, labelled A and B. It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. You would conclude that

(i) liquid A is a better conductor than liquid B.

(ii) liquid B is a better conductor than liquid A.

(iii) both liquids are equally conducting.

(iv) conducting properties of liquid cannot be compared in this manner. read less

Shobana S.

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Liquid A is better conductor than Liquid B.
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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

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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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