Question
Give an example when objects undergo combinations of different types of motion?
✓
Answer
The motion of a ball on the ground. Here the ball is rolling on the ground and rotating as well as moving forward on the ground. Thus, the ball undergoes a rectilinear motion as well as rotational motion.
$\text{Average speed}=\frac{\text{Total distance covered}}{\text{Total time taken}}$
$\text{Average speed}=\frac{\text{Total distance covered}}{\text{Total time taken}}$
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Q.1. What did Rakshita observe when she passed exhaled air into lime water?
(a) The lime water became clear
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(c) The lime water turned milky
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Q.2. What does the change in lime water indicate about exhaled air?
(a) It contains more oxygen than inhaled air
(b) It contains nitrogen gas
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(b) It shows that carbon dioxide is a product of respiration
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Rakshita conducted an experiment with lime water and exhaled air. When she exhaled in lime water, it changed its appearance. Based on her observations, choose the correct option for each question below:
Q.1. What did Rakshita observe when she passed exhaled air into lime water?
(a) The lime water became clear
(b) The lime water turned blue
(c) The lime water turned milky
(d) The lime water evaporated
Q.2. What does the change in lime water indicate about exhaled air?
(a) It contains more oxygen than inhaled air
(b) It contains nitrogen gas
(c) It contains more carbon dioxide than inhaled air
(d) It is cooler than inhaled air
Q.3. How is this experiment helpful in understanding respiration?
(a) It shows that oxygen is produced during respiration
(b) It shows that carbon dioxide is a product of respiration
(c) It confirms that air does not affect lime water
(d) It demonstrates that carbon dioxide dissolves lime water.
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Across:
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