An a.c. generator can be converted into a d.c. generator by replacing
the slip rings with split-ring commutators
the slip rings with armatures
the split-rings with slip rings
the split-rings with brushes
the brushes with slip-ring commutators.
Correct answer is A
No explanation has been provided for this answer.
6.0cm
9.0cm
18.0cm
360cm
72.0cm
Correct answer is B
No explanation has been provided for this answer.
a decrease in the mean speed kinetic energy of the molecules
an increase in the mean speed of the molecules
an increase in the momentum change at each collision.
an increase in the number of collisions per second
an increase in the pressure exerted by the gas.
Correct answer is A
No explanation has been provided for this answer.
M1 + M2 ÷ M1U
M2U ÷ M1 – M2
M1U ÷ M1 – M2
M1U ÷ M1+ M2
M2U ÷ M1 + M2
Correct answer is D
No explanation has been provided for this answer.
A short response time is obtained in a liquid-in-glass thermometer when the
bulb is large and thick-walled
bulb is small and thick-walled
stem is long and thin
liquid is of high density and the bulb is large
bulb is thin-walled and the liquid is a good conductor of heat.
Correct answer is E
No explanation has been provided for this answer.