General Science - Physics MCQs

31.

Which of the following is an instrument for measuring electric charge or electrical potential difference?

   A.) ohmmeter
   B.) Electrometer
   C.) Ammeter
   D.) Voltmeter

Answer: Option 'B'

Electrometer

32.

At which of the following places water shall boil at the lowest temperature?

   A.) Kochi
   B.) ooty
   C.) Mount Abu
   D.) New Delhi

Answer: Option 'B'

Ooty

33.

Which of the following causes the drop of water to be in spherical shape?

   A.) Temperature
   B.) Surface tension
   C.) Viscosity
   D.) Air resistance

Answer: Option 'B'

Surface tension

34.

Which among the following radiations in the Sunlight causes tanning and sunburn?

   A.) Micro waves
   B.) Ultraviolet
   C.) Visible
   D.) Infrared

Answer: Option 'B'

Ultraviolet

35.

A piece of Ice was tied with a string to a water bucket’s bottom, and the water bucket was filled with water with ice fully submerged in it. What would be the impact on the level of water when the ice melts away completely?

   A.) The level of water will first increase then come to the previous on
   B.) The level of water will go up
   C.) The level of water will go down
   D.) The level of water will remain unchanged

Answer: Option 'C'

The level of water will go down
There are two dimensions of this experiment. One is when Ice floats in water and another is as mentioned in the question. When Ice floats in water, the level of water will remain unchanged when the ice melts away because in this situation, Ice replaced water which is `equal to its weight`. But when the floating ice is taken down in the bottom of the bucket and tied over there with a string, and let melt away, the level of water will come down because now the ice was replacing the water `equal to its volume `and Ice has a lower density of water. So The answer of this question is -The level of water will go down.

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