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Suppose the distance between earth and sun becomes half of its present distance. What is likely to happen to life?

Answer: Life may no longer exist because some special environmental conditions are needed for the existence and continuation of life on the... View Article

Suppose the moon emits light of its own. Would it still have phases? Justify your answer

Answer: As the moon does not emit its own light and reflects the light of the sun. phases are seen. Because of the revolution of the earth, the... View Article

Suppose you are outside your home and an earthquake strikes. What precaution would you take to protect yourself?

Answer: An earthquake is the shaking of the Earth's surface caused by a sudden release of energy in the Earth's crust, which causes seismic... View Article

Tell what property allows you to compute 1/3 × (6 × 4/3) as (1/3 × 6) × 4/3

Answer: Given 1/3 × (6 × 4/3) = (1/3 × 6) × 4/3 In this case, the way factors are arranged in a multiplication issue apparently has no effect... View Article

The aluminium strips in an electroscope as shown in fig. are replaced by plastic strips and a charged body is brought in contact with the metal clip. What will happen?

Answer: We cannot predict whether the object is charged or not if aluminium strips are replaced with plastic strips, as there will be no... View Article

The angle between the incident ray and the reflected ray is 60°. What is the value of the angle of incidence?

Answer: The angle of reflection is equal to the angle of incidence. Since Angle of incident ray+ Angle of reflected ray is 60°. The angle of... View Article

The average weather taken over a long time is called ___________.

Answer: The average weather taken over a long time is called climate. Cloudy, sunny, rainy, stormy, or clear weather all are possibilities. It is... View Article

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

Answer: It's possible that the bulb isn't glowing for the following reasons: It's possible that the liquid isn't conducting. The circuit is... View Article

The chemical symbol for nitrogen gas is (a) Ni (b) N₂ (c) N⁺ (d) N

Answer: (b) N2 The chemical formula of Nitrogen is N but Nitrogen exist in the molecule of two ions hence the chemical symbol of Nitrogen gas is... View Article

The decaying leaves and animal droppings in a forest enrich the ___

Answer: The decaying leaves and animal droppings in a forest enrich the soil. Forests help purify and increase the oxygen content in the air by... View Article

The distance between the object and its image formed by a plane mirror appears to be 24 cm. What is the distance between the mirror and the object?

Answer: The image generated by a plane mirror is the same distance behind the mirror as the object in front of it.∴ Object distance from... View Article

The earth’s plate responsible for causing earthquakes is (a) the crust of the earth (b) the mantle of the earth (c) the inner core of the earth (d) the outer core of the earth

Answer: (a) the crust of the earth Sudden trembling or shaking of the earth due to disturbance deep down its top layer called the crust. An... View Article

The first of a month is the new moon day. On fifteenth of the same month, which of the following figures would represent the phase of the moon?

Answer: (a) There will be a full moon day after 15 days of new moon days, and we will be able to see the full moon on the fifteenth day of the... View Article

The gas we use in the kitchen is called liquified petroleum gas (LPG). In the cylinder it exist as a liquid. When it comes out from the cylinder it becomes a gas (Change – A) then it burns (Change – B). The following statements pertain to these changes. Choose the correct one. (i) Process – A is a chemical change. (ii) Process – B is a chemical change. (iii) Both processes A and B are chemical changes. (iv) None of these processes is a chemical change

Answer: (ii) Process – B is a chemical change A substance is said to undergo a chemical change when the chemical properties of a substance... View Article

The handle of a cricket bat or a badminton racquet is usually rough. Explain the reason.

Answer: The handle of a cricket bat or a badminton racquet is rough so that the bat or racquet does not slip out of the player's hands during... View Article

The insects, butterflies, honeybees and birds help flowering plants in ___

Answer: The insects, butterflies, honeybees and birds help flowering plants in pollination. Pollination is a biological process in which the... View Article

The loudness of sound is determined by the (a) amplitude of vibration (b) the ratio of amplitude and frequency of vibration (c) frequency of vibration (d) product of amplitude and frequency of vibration

Answer: (a) amplitude of vibration Sound is directly proportional to the loudness of sound. As a result by decreasing amplitude loudness of the... View Article

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