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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

The loudness of sound is measured in units of (a) Decibel (dB) (b) Hertz (Hz) (c) Metre (m) (d) Metre/Second (m/s)

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

The movement of the earth’s plates causes (a) cyclones (b) lightning (c) earthquakes (d) thunderstorms

Answer: (c) earthquakes Earthquakes occur when the earth's plates brush against one another or undergo collision. Buildings, dams, and other... View Article

The object to be electroplated is taken as ____________ electrode.

Answer: The object to be electroplated is taken as a cathode electrode. Electroplating is the process of aligning another metal onto metal.... View Article

The plane in which the earth revolves around the sun is called the equatorial plane of earth. (True or False)

Answer: The plane in which the earth revolves around the sun is called the equatorial plane of earth - False Earth revolves around the sun in... View Article

The planet nearest to us is Jupiter. (True or False)

Answer: The planet nearest to us is Jupiter - False Mercury is the nearest planet to the Earth. Mercury is the smallest planet in the solar... View Article

The planet Venus appears in the eastern sky before sunrise. (True or False)

Answer: The planet Venus appears in the eastern sky before sunrise - True Venus appears either in the eastern sky before sunrise or in the... View Article

The planets do not emit light of their own. (True or False)

Answer: The planets do not emit light of their own - True Stars have their own light and twinkle in the night, but a planet does not have their... View Article

The planets keep changing their position with respect to stars. (True or False)

Answer: The planets keep changing their position with respect to stars - True Planets are celestial bodies that do not emit heat or light of... View Article

The plates of the outermost layer of the earth are always in continuous motion. (True & False)

Answer: True The earth’s lithosphere is composed of seven or eight major plates and many minor plates. The lithosphere is a rigid outermost... View Article

The process of depositing a layer of any desired metal on another material by means of electricity is called _________.

Answer: The process of depositing a layer of any desired metal on another material by means of electricity is called electroplating.... View Article

The process of electric discharge cannot occur between clouds and the earth. (True & False)

Answer: False The process of electric discharge occurs between clouds and the earth. Lightning is easily explained as a spark that occurs on a... View Article

The strips of an electroscope diverge when a charged body is brought in contact with the metal clip. Now the clip is touched gently by our hand. What will happen to the strips? Explain.

Answer: When we touch strips of electroscope with our hand, the charge in the strips is discharged through our hand, and the strips return to... View Article

The town hall building is situated close to Boojho’s house. There is a clock on the top of the town hall building which rings the bell every hour. Boojho has noticed that the sound of the clock appears to be much clearer at night. Explain.

Answer: To travel, sound required a medium. Sound cannot travel in a vacuum because there is no medium to transmit sound waves. So it requires a... View Article

The two regions of the earth with extreme climatic conditions are _ and .

Answer: The two regions of the earth with extreme climatic conditions are the polar region and the tropical region. The polar regions represent... View Article

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