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 :
(a) a straight line
(b) a elliptical path
(c) a circular path
(d) a parabolic path
(c) a circular path
Explanation:
As the ladder slips, its midpoint traces a circular path because the ladder forms a right triangle with the wall and floor at all times, and the midpoint is equidistant from both the floor and the wall. The motion of the midpoint corresponds to the arc of a circle.
For which one of the following is capillarity not the only reason?
(a) Blotting of ink
(b) Rising of undergound water
(c) Spread of water drop on a cotton cloth
(d) Rising of water from the roots of a plant to its foliage
(b) Rising of underground water
Explanation:
The rising of underground water is influenced by capillarity but also by pressure differences and gravity acting within porous soil layers. Other options (like blotting of ink or spread of water) are purely caused by capillarity.
Consider the follwing 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?
(a) 1, 2 and 3
(b) 1 and 2
(c) 2 and 3
(d) 1 and 3
Correct Answer: (a) 1, 2, and 3
Explanation:
Which one of the following statements is correct ?
A slab of ice kept in a room :
(a) does not radiate heat
(b) does not radiate heat but absorbs heat from the surrounding
(c) radiates heat but absorbs more heat from the surrounding
(d) radiates heat more than that absorbed by it from the surrounding
(b) does not radiate heat but absorbs heat from the surrounding
Explanation:
Ice is at a lower temperature than its surroundings and primarily absorbs heat from the environment through conduction and convection. It does not radiate heat significantly as its temperature is too low.
A body lying at rest suddenly breaks into two parts of equal masses which start moving. The two parts will move in :
(a) opposite direction with equal speed
(b) same direction with equal speed
(c) any direction with unequal speed
(d) opposite direction with unequal speed
(a) opposite directions with equal speed
Explanation:
By the law of conservation of momentum, the total momentum before and after the break remains zero (since the body was initially at rest). Therefore, the two parts move in opposite directions with equal speed to balance their momenta.
Consider the following statements :
1. Horsepower is a bigger unit of power than kilowatt
2. One thousand crore is equal to
3. One acre is slightly greater than 5000 square metres
Which of the statements given above is/are correct?
(a) 1 and 2
(b) 2 only
(c) 1 and 3
(d) 2 and 3
Correct Answer: (d) 2 and 3
Explanation:
Match the following :
| A. | Movement of water and minerals from earth to leaves of plants through roots | 1. | Bernoulli's principle | |
| B. | Lift of an acroplane during its flight | 2. | Capillary action | |
| C. | Formation of a star in the universe | 3. | Surface tension | |
| D. | Cleaning action of soap | 4. | Gravitational force |
A B C D
2 1 4 3
A B C D
2 4 3 1
A B C D
3 1 2 4
A B C D
3 4 2 1
Correct Answer: (a) 2, 1, 4, 3
Explanation:
Barium in a suitable form is administered to patients before an X-ray examination of the stomach, because :
(a) barium allows X-rays to pass through the stomach on account of its transparency to X-rays
(b) barium compound, like magnesium sulphate helps in cleaning the stomach before X-ray examination
(c) barium is a good absorber of X-rays and this helps the stomach to appear clearly in contrast with the other regions in the picture
(d) barium salts are white in colour and this helps the stomach to appear clearly in contrast with other regions in the picture
(c) Barium is a good absorber of X-rays, and this helps the stomach to appear clearly in contrast with the other regions in the picture.
Explanation:
Barium compounds (like barium sulfate) are used as contrast agents because they absorb X-rays efficiently. This makes the stomach and other gastrointestinal regions appear prominently on the X-ray image.
Consider the following statements regarding a motor car battery :
1. The voltage is usually 12 V
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?
(a) 1 and 2
(b) 2 and 3
(c) 3 and 4
(d) 1 and 4
Correct Answer: (d) 1 and 4
Explanation:
Consider the following statements :
The fog during winter season is more on the day when
1. sky is clear
2. sky is cloudy
3. wind is blowing
Which of the statements given above is/are correct?
(a) 1 only
(b) 1 and 3
(c) 2 and 3
(d) 2 only
(a) sky is clear
Explanation:
On clear nights, the earth loses heat through radiation, cooling the surface and the air near it. This increases condensation, leading to fog formation. Cloudy skies, on the other hand, retain heat and reduce the likelihood of fog.
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