By which one of the following can a real image be produced?

Q-1: By which one of the following can a real image be produced? Can it be produced by a:

1) concave mirror
2) plane mirror
3) diverging lens
4) convex mirror
ANSWER: 1 -- CONCAVE MIRROR

Q-2: A metal ball on an insulated stand is touched by a positively charged glass rod. What happens to the metal ball? Does it

1) gain protons and lose electrons
2) gain protons
3) gain more protons than electrons
4 lose electrons
ANSWER: 4 -- LOSE ELECTRONS

Q-3:A zinc plate is attached to the knob of a negatively charged electroscope. What will happen to the leaves of the electroscope when ultraviolet light is shown on the zinc plate. Will the leaves:

1) collapse at once
2) gradually come together
3) gradually spread further apart
4) remain unaffected
ANSWER: 2 -- GRADUALLY COME TOGETHER

Q-4: A high voltage applied to a gas discharge tube containing neon gas at very low pressure causes a current to flow through the tube. Which one of the following are the particles that flow towards the cathode? Are they

1) electrons
2) protons
3) negatively charged neon ions
4) positively charged neon ions
ANSWER: 4 -- POSITIVELY CHARGED NEON IONS

Q-5:  Which of the following phrases completes the following statement: The strength of the electric field between two oppositely charged parallel plates is:

1) a maximum midway between the plates
2) a maximum near the positively charged plate
3) constant between the plates except near the edges
4) zero midway between the plates
ANSWER: 3 -- CONSTANT BETWEEN THE PLATES EXCEPT NEAR THE
EDGES

Q-6: Which one of the following is the advantage of connecting two dry cells in parallel instead of in series? Is it because the parallel arrangement:

1) gives twice the EMF of one dry cell
2) has no internal resistance
3) generates heat in an external circuit half as fast as would a single cell
4) has half the internal resistance of a single cell
ANSWER: 4 -- HAS HALF THE INTERNAL RESISTANCE OF A SINGLE CELL

Q-7:  Magnetic lines of force have all but one of the following characteristics. The one that they DO NOT have is:

1) they go from the South-pole to the North-pole of a magnet outside of the magnet
2) they are most concentrated at the poles of a magnet
3) they pass through copper
4) they never cross one another
ANSWER: W -- THEY GO FROM THE SOUTH-POLE TO THE NORTH-POLE OF THE M AGNET

Q-8:  Which one of the following is the way in which a galvanometer is converted into a voltmeter? Is it by connecting:

1) a high resistance coil in parallel with its moveable coil
2) a low resistance coil in parallel with its moveable coil
3) a high resistance coil in series with its moveable coil
4) a low resistance coil in series with its moveable coil
ANSWER: 3 -- A HIGH RESISTANCE COIL IN SERIES WITH ITS MOVEABLE COIL