Secondary School (English Medium) (5 to 8) Class 7 - CBSE Question Bank Solutions for Science

David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be ______.

In the circuit shown in figure, what will be the order in which the bulbs A, B and C will glow when the switch is moved to the ‘ON’ position?

You were blindfolded and asked to identify the drinks provided in two different glasses. You could identify drink A as lime juice and B as bitter gourd juice. How could you do it in spite of being blindfolded?

Boojho took some grains of boiled rice in test tube ‘A’ and Paheli took boiled and chewed rice in test tube ‘B’. Both of them poured 1-2 drops of iodine solution into the test tube and observed the colour change. What colour change would they have observed? Give reasons for your answer.

Ruminants such as cows and buffaloes swallow their food hurriedly and then sit restfully and chew their food. Can you reason why?

Paheli wanted to buy a gift made of animal fibre obtained without killing the animal. Which of the following would be the right gift for her to buy?

Wool fibre cannot be obtained from which of the following?

Wool yielding animals bear ______ on their body.

State whether the following statement is True or False. If false, correct them.

In India, camels and goats are generally reared for obtaining wool.

State whether the following statement is True or False. If false, correct them.

In the process of obtaining wool from fleece, sorting is done after scouring.

How do the hair of certain animals help in keeping their bodies warm?

Various steps involved to obtain wool from fleece are given here.

1. Picking out the burrs
2. Dyeing in various colours
3. Shearing
4. Scouring
5. Sorting

Write the above steps in the correct sequence in which they are carried out.

Figure shows three rings of circles with letters in them. Some of these letters in each ring can form the name of one wool yielding animal. Find the names of these animals.

A wholesale woollen fibre dealer gets the woollen fibre of different textures sorted for various purposes. Match the items in Column I with the woollen fibre in Column II.

Paheli and Boojho measured their body temperature. Paheli found her’s to be 98.6°F and Boojho recorded 37°C. Which of the following statement is true?

Figure (a–d) shows the readings on four different thermometers. Indicate which of the reading shows the normal human body temperature?

For setting curd, a small amount of curd is added to warm milk. The microbes present in the curd help in setting if the temperature of the mixture remains approximately between 35°C to 40°C. At places, where room temperature remains much below the range, setting of curd becomes difficult. Suggest a way to set curd in such a situation.