Winds, Storms and Cyclones — Science STD 7 — Question

Draw a diagram to explain the different seasons on Earth.

Define an electric circuit and give symbols of two electrical components.

Why artificial silk is much cheaper than natural silk?

Setting of curd is regarded as a chemical change, explain why?

Have you even wondered why you get muscle cramps after heavy exercise?

Give Reasons: All clocks make use of some periodic motion.

Define the following:

• Crown
• Understoreys

After we work hard or perform physical activity, we feel hungry. Explain why.

Manya is blindfolded. She is given two unknown solutions to test and determine whether they are acidic or basic. Which indicator should Manya use to test the solutions and why?

Write one advantage and one disadvantage of an electromagnet relative to a bar magnet.