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Physics Past Questions


Question 4191:


Which of the following statements about a moving object is correct?

A. When accelerating, the resultant force acting on it must be equal to zero.
B. There must always be a non-zero resultant force acting on it.
C. At a steady velocity, the resultant force acting on it must be equal to zero
D. At a steady velocity, the air resistance must be equal to zero.


Question 4192:


If the efficiency of a transformer is 100%, which of the following equations would be correct?

A. N\(_p\)E\(_p\) = N\(_s\)E\(_s\)
B. N\(_s\)I\(_p\)= N\(_p\)I\(_s\)
C. N\(_s\)I\(_s\) = N\(_p\)I\(_p\)
D. I\(_p\)E\(_s\) = I\(_s\)E\(_p\)


Question 4193:


A freshly demagnetized bar magnet is placed in the East-West direction to ensure that

A. The molecular magnets remain randomly arranged.
B. The molecular magnets are properly aligned
C. It is affected by the earth's magnetic field
D. The magnetic domains are within the earth's field


Question 4194:


Which of the following graphs of a charge Q against potential difference V across the capacitor is correct?

A. A
B. B
C. C
D. D


Question 4195:


A small amount of air is introduced into the vacuum above the mercury in a mercury barometer tube. The mercury level goes down because the air molecules

A. Heat the mercury and make it expand
B. Increase the pressure above the mercury.
C. Cool the mercury and make it contract.
D. Decrease the pressure above the mercury






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