Physics Past Questions and Answers

Question 4786:

An ammeter of resistance $S$ has a fullscale deflection when a current of $50\mathrm{mA}$ flows in it. The value of the resistor required to adapt It to measure a current of $5\mathrm{A}$ is ____________

A. $5.00$
B. $0.05$
C. $19.8\mathrm{ft}$
D. $0.25$

Question 4787:

Two cell each of e.m.f $1.5\mathrm{V}$ and an internal resistance 2 ohms are connected in parallel. Calculate the current flowing when the cells are connected to a 1 ohms resistor.

A. $0.75\mathrm{ohms}$
B. $1.50\mathrm{hms}$
C. 0 ohms
D. $1.0\mathrm{ohms}$
E. $0.600\mathrm{ohs}$

Question 4788:

The capacitance of a parallel plate capacitor when in air is 3 of and in the presence of a dielectric material 6 of. The dielectric constant is ____________

A. 9
B. 18
C. 3
D. 2

Question 4789:

Which of the following may be used to determine relative humidity in a physics laboratory?
I. Manometer
II. Wet-and-dry bulb hygrometer
III. Hair hygrometer
IV. A hydrometer

A. I only
B. II and only
C. II only
D. III only
E. II, III and IV only

Question 4790:

An electric heater with a p.d of $240\mathrm{V}$ connected across its terminals has a total resistance of $960\mathrm{g}$ find the power rating of the heater

A. $0.25\mathrm{W}$
B. $60.00\mathrm{W}$
C. $38AOW$
D. AOOW