Which of the following cannot be charged easily by friction?
(a). A plastic scale
(b). A copper rod
(c). An inflated balloon
(d). A woollen cloth
1 Answers
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A boy holding a gas filled balloon releases it. The balloon starts to go up, then its potential energy will
Ans.(B) The energy comes from the surrounding atmosphere. When the balloon moves up, it displaces the air above it. This air has to be transferred to the space below the balloon....
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First the temperature is 23.4 C of a balloon which is filled with 2L air. what will be the volume of the balloon when the temperature is 26.1C?
Let, V1 = 2 L Given, T1 = 23.4 °C or 296.4 K T2 = 26.1 °C or 299.1 K V2 be the volume at temperature T2 If the pressure remains constant, then apply Charle’s law: V1/T1 = V2/T2 V2 = V1T2/T1 = 2...
1 Answers 1 views
When a glass rod is rubbed with a piece of silk cloth the rod a. and the cloth both acquire positive charge.
(b). becomes positively charged while the cloth has a negative charge.
1 Answers 1 views
A charged glass rod attracts a charged plastic straw.
true.............
1 Answers 1 views
Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon?
charged balloon is repelled by another charged balloon because both carry same charges and we know same charges repel each other whereas an uncharged balloon is attracted by charged balloon...
1 Answers 4 views
A wholesale woollen fibre dealer gets the woollen fibre of different textures sorted
(a) (iii); (b) (i); (c) (ii); (d) (iv)
1 Answers 1 views
To keep her soup warm Paheli wrapped the container in which it was kept with a woollen cloth.
Yes. Wool is poor conductor of heat.
1 Answers 1 views
The weight of an empty balloon on a spring balance is W_1. The weight becomes W_2 when the balloon is filled with air.
(a) W2 = W1. (c) W2 < W1+ W. EXPLANATION: The weight of the empty balloon is W₁. The weight of the balloon filled with air should be W₁+w but the balloon is...
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How many pieces of 8.6 metres length cloth can be cut out of a length of 455.8 metres cloth?
(d) Number of pieces = 455.8/8.6 = 53
1 Answers 2 views
Fold a piece of cloth 3-4 times. Now bring it close to your mouth and blow hard on it. Did the cloth become warm?
Yes, the cloth has become warm.
1 Answers 1 views