A lead-acid accumulator is used in preference to a dry battery in a car because
a dry battery cannot supply the necessary high voltage
a dry battery would not operate on a cold frosty morning
the accumulator can give a bigger current and can be recharged
the accumulator can supply a.c
the chemicals used in a dry battery constitute a fire hazard.
Correct answer is C
No explanation has been provided for this answer.
What gives rise to the line spectra observed in atoms?
change of an electron from a higher to a lower energy level in the atom
disturbed protons in the nucleus
excitation of an electron in the atom
kinetic energy of a moving atom
potential energy of an electron inside an atom
Correct answer is A
No explanation has been provided for this answer.
420 J
1680 J
1701 J
2100 J
3780 J
Correct answer is E
No explanation has been provided for this answer.