What is the purpose of using an electric switch? Name some electrical gadgets that have switches built into them.
A switch is used to complete or break an electric circuit to use an electric appliance according to our convenience.... View Article
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Suppose you want to dry your school uniform quickly. Would spreading it near an anghiti or heater help? If yes, how?
Yes, spreading of clothes near a heater would help to dry the clothes quickly. This is because a heater provides... View Article
The silkworm is (a) a caterpillar, (b) a larva. Choose the correct option. (i) a (ii) b (iii) both a and b (iv) neither a nor b.
Answer: (iii) both a and b Explanation The silkworm is the larva ( the active immature form of an insect)or... View Article
How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?
Infinite images are formed when two plane mirrors are placed parallel to each other, irrespective of the distance. Explanation One... View Article
To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet.
The gases that we breathe our contain water vapour which condenses at spectacles. So, the glass becomes wet and with the... View Article
Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler. (True or False)
True Explanation The water vapour condenses to form tiny droplets of water in the upper layers of air, where it... View Article
Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on.
Similarities between the motion of a bicycle and a ceiling fan that has been switched on are: (i) The blades... View Article
Normal range of breathing rate per minute in an average adult person at rest is: (i) 9–12 (ii) 15–18 (iii) 21–24 (iv) 30–33
Normal range of breathing rate per minute in an average adult person at rest is (ii) 15–18. Explanation Breathing (or... View Article
Given below is a sequence of steps in the processing of wool. Which are the missing steps? Add them. Shearing, __________, sorting, __________, __________, _________.
Shearing, Scouring, sorting, Cleaning of burrs, Dyeing, Rolling. Explanation The various steps for processing fibres into wool are as follows:... View Article
The angle of incidence is equal to the angle of reflection. (a) Always (b) Sometimes (c) Under special conditions (d) Never
Answer: (a) Always, the Angle of incidence is equal to the angle of reflection. Explanation When light is reflected from... View Article
Which of the following is NOT a member of the solar system? (a) An asteroid (b) A satellite (c) A constellation (d) A comet
Answer: (c) A Constellation. Constellation A constellation is a group of stars forming a recognizable shape. A constellation is a... View Article
Why do farmers grow many fruits and vegetable crops inside large greenhouses? What are the advantages to the farmers?
Greenhouse provides favourable conditions for many fruits and vegetable crops like it always gives favourable temperature heat, light etc .... View Article
Mark ‘T’ if the statement is true and ‘F’ if it is false: During heavy exercise the breathing rate of a person slows down.
During heavy exercise, the breathing rate of a person slows down. (False) Explanation Breathing rates may increase from a normal... View Article
How can you contribute to the maintenance of green wealth of your locality? Make a list of actions to be taken by you.
The green wealth of the locality is the responsibility of every resident. Green wealth refers to the forests, vegetation that... View Article
A bar magnet has no markings to indicate its poles. How would you find out near which end is its north pole is located?
The location of the poles of the magnet can be determined by suspending it freely. A freely suspended bar magnet... View Article
In a completely dark room, if you hold up a mirror in front of you, will you see a reflection of yourself in the mirror?
No, we will not see our reflection in a mirror in a dark room because an image is formed only... View Article
You accidentally dropped your favorite toy and broke it. This is a change you did not want. Can this change be reversed?
No, this change cannot be reversed. Explanation Though this is an irreversible change, but it did not cause any change... View Article
To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Yes, this change can be reversed by unfolding the dress. Explanation A change which can happen backward, that is, can... View Article
The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as _____________.
The transfer of pollen grains from the anther to the stigma of the same or of another flower of the... View Article
The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train.
Given that, Distance of two stations = 240 km Time taken by the train = 4 hours The equation of... View Article
