1. Summer
2. Winter
3. Spring season
4. Rainy season
Option “2” is correct. A pendulum clock runs faster in winter because in winter the length of the pendulum or the swing become smaller due to contraction and the clock begin to run fast.
432. Oil spreads on water surface because-
1. Oil is denser than water
2. Oil is less dense than water
3. Surface tension of oil is more than water
4. Surface tension of oil is less than water
Option “4” is correct. Oil spreads on water surface because the surface tension of oil is less than water.
433. Why does ice covered in sawdust not melt quickly?
1. Sawdust does not allow the air to touch the ice
2. The water is absorbed by sawdust
3. Sawdust is a bad conductor of heat
4. Sawdust is good conductor of heat
Option “3” is correct. Saw dust is used to cover ice because it is poor conductor of heat. It did not let the ice melt quickly, as it does not transfer the heat of the surrounding to the ice.
434. The washing machine works on the principle of ____________
Option “4” is correct. Air is optically rarer than water, the ray of light bends away from the normal at the point of incidence when moving from water to air while it bends towards the normal while moving from air to water. It is clearly visible that the air bubble acts as a DIVERGING LENS (concave lens) in water.
436. The frequency of direct current is ____________
1. Zero
2. 50 HZ
3. 60 HZ
4. 100 HZ
Option “1” is correct. DC implies no changes in value. Frequencies of signals are defined by how many changes per time, e.g. 60 cycles per second. In case of DC with there are 0 changes per second. Hence the frequency of DC is zero.
437. If a body is moving on a circular path, what is its average velocity if it completes one cycle in one second?
1. Average velocity depends upon time taken to complete one cycle
2. One
3. Average velocity is same as average speed
4. Zero
Option “4” is correct. When a body is moving in a circular path, its average velocity when it complete one cycle in one second is zero.
438. Telephone exchange was invented by?
1. Tivadar Puskas
2. Joseph Priestley
3. Petrache Poenaru
4. James Leonard Plimpton
Option “1” is correct. Telephone exchange was invented by Tivadar Puskas.
439. What will happen to the force between the two positive charges which are released after being held near each other?
1. Force will increase
2. Force will decrease
3. Force will stay the same
4. Force first increases to reach maximum before starting to decrease
Option “2” is correct. Two Positive charges will repel to each other so the force will decrease between two positive charge.
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