22) a) How are clouds formed?
b) State for each of the following
whether it is due to evaporation or
condensation:
(i) steam rising from wet clothes
while they are ironed.
(ii) water drops appear on the outer
surface of a glass containing cold water.
23) a) What is the composition of air?
b) In a number of musical instruments,
air plays an important role. Can you name
some such
instruments?
24) a) What are joints? Name the type of
joints.
b) Write the type of joint which is use
for each of the following movements:
i) A cricketer bowler bowls the ball.
ii) A person lifts weight to build up his
biceps.
Answers
Answer:
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Answer:
Explanation:
22. (a) Condensation
(b) Evaporation
(c) Condensation
(d) Evaporation
(e) Evaporation
23. Air plays an important role in a number of musical instruments such as trumpet, mouth organ, flute, etc.
24. A- It is a combination of joints that help us in throwing. Saddle joints and hinge joints are majorly involved in such movements.
B- Pivot joint plays the major role in moving head in right and left direction
C- One of the major function of human skeleton is to help us in locomotion. It helps us to keep the posture right.
D- Skull: it protects our brain from injury
Spinal cord: Neural transmission is impossible if we don't have spinal cord which is protected by a vertebral bone
Ribs: it protects our vital organs such as heart and lungs