21/02/2013 15:44
| 1. |
Radiocarbon is produced in the atmosphere as a result of
|
| A. |
collision between fast neutrons and nitrogen nuclei present in the atmosphere |
| B. |
action of ultraviolet light from the sun on atmospheric oxygen |
| C. |
action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere |
| D. |
lightning discharge in atmosphere |
|
| 2. |
It is easier to roll a stone up a sloping road than to lift it vertical upwards because
|
| A. |
work done in rolling is more than in lifting |
| B. |
work done in lifting the stone is equal to rolling it |
| C. |
work done in both is same but the rate of doing work is less in rolling |
| D. |
work done in rolling a stone is less than in lifting it |
|
| 3. |
The absorption of ink by blotting paper involves
|
| A. |
viscosity of ink |
| B. |
capillary action phenomenon |
| C. |
diffusion of ink through the blotting |
| D. |
siphon action |
|
| 4. |
Siphon will fail to work if
|
| A. |
the densities of the liquid in the two vessels are equal |
| B. |
the level of the liquid in the two vessels are at the same height |
| C. |
both its limbs are of unequal length |
| D. |
the temperature of the liquids in the two vessels are the same |
|
| 5. |
Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to
|
| A. |
the heating effect of current alone |
| B. |
hysteresis loss alone |
| C. |
both the heating effect of current and hysteresis loss |
| D. |
intense sunlight at noon |
|
| 6. |
Nuclear sizes are expressed in a unit named
|
|
|
| 7. |
Light year is a unit of
|
| A. |
time |
B. |
distance |
| C. |
light |
D. |
intensity of light |
|
| 8. |
Mirage is due to
|
| A. |
unequal heating of different parts of the atmosphere |
| B. |
magnetic disturbances in the atmosphere |
| C. |
depletion of ozone layer in the atmosphere |
| D. |
equal heating of different parts of the atmosphere |
|
| 9. |
Light from the Sun reaches us in nearly
|
| A. |
2 minutes |
| B. |
4 minutes |
| C. |
8 minutes |
| D. |
16 minutes |
|
| 10. |
Stars appears to move from east to west because
|
| A. |
all stars move from east to west |
| B. |
the earth rotates from west to east |
| C. |
the earth rotates from east to west |
| D. |
the background of the stars moves from west to east |
|
| 11. |
Pa(Pascal) is the unit for
|
| A. |
thrust |
B. |
pressure |
| C. |
frequency |
D. |
conductivity |
|
| 12. |
Planets do not twinkle because
|
| A. |
they emit light of a constant intensity |
| B. |
their distance from the earth does not change with time |
| C. |
they are very far away from the earth resulting in decrease in intensity of light |
| D. |
they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable |
|
Answer 1.
Answer: Option A
2.
Answer: Option D
3.
Answer: Option B
4.
Answer: Option B
5.
Answer: Option C
6.
Answer: Option A
Explanation:Fermi - A unit of length equal to 10-15 meter (one femtometer), used in nuclear physics. It is similar to the diameter of a proton.
7.
Answer: Option B
8.
Answer: Option A
9.
Answer: Option C
10.
Answer: Option B
11.
Answer: Option B
12.
Answer: Option D
