21). A person stands at the middle point of a wooden ladder which starts slipping between a vertical wall and the floor of a room, while continuing to remain in a vertical plane. The path traced by a person standing at the middle point of the slipping ladder is :
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22). For which one of the following is capillarity not the only reason ?
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23). Consider the following statements with reference to X-rays : 1. They produce heat when absorbed by matter 2. They are generated when fast moving electrons strike a metal target 3. They can penetrate through a thin sheet of aluminium Which of the statements given above are correct ?
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24). Which one of the following statements is correct ? A slab of ice kept in a room :
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25). A body lying at rest suddenly breaks into two parts of equal masses which start moving. The two parts will move in :
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26). Consider the following statements : 1. Horsepower is a bigger unit of power than kilowatt 2. One thousand crore is equal to \( \large 10^{10} \) 3. One acre is slightly greater than 5000 square metres Which of the statements given above is/are correct ?
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27). Match the following : A. Movement of water and 1. Bernoulli's water and minerals from Principle from earth to leaves of plants through roots B. Lift of an aeroplane 2. Capillary action during its flight C. Formation of a star in the 3. Surface tension universe D. Cleaning action of soap 4. Gravitational force Below options are given in A B C D order
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28). Barium in a suitable form is administered t patients before and X-ray examination of the stomach, because :
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29). Consider the following statements regarding a motor car battery: 1. The voltage is usually 12V 2. Electrolyte used is hydrochloric acid 3. Electrodes are lead and copper 4. Capacity is expressed in ampere-hour Which of the above statements are correct?
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30). Consider the following statements: The fog during winter season is more on the day when 1. sky is clear 2. sky is cloudy 3. wing is blowing Which of the statements given above is/are correct?
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