A bar magnet is placed near and lying along the axis of a solenoid connected to a galvanometer. The pointer of the galvanometer shows no deflection when?

• A. the magnet is moved towards the stationary solenoid
• B. there is no relative motion
• C. the magnet is moved away from the stationary solenoid
• D. the solenoid is moved away from the stationary magnet

A wire of length 100 cm has a resistance of 10\(\Omega\). If its cross-sectional area is 0.005cm², determine its resistivity

• A. 0.0005\(\Omega\)cm
• B. 0.0015\(\Omega\)cm
• C. 0.0016\(\Omega\)cm
• D. 0.0700\(\Omega\)cm

The circuit diagram below contains four ammeters W, X, Y and Z, Which of the following statements about the ammeter readings is correct

• A. The reading of W is equal to that of Y and twice that of X
• B. The reading of Y is greater than that of Z
• C. The readings of W and Y are equal and each is greater than that of X
• D. The reading of Z is equal to the sum of the readings of Y and W

The current output from of an a.c. source is given as I = 10 sin to t. The d.c equivalent of the current is

• A. 5.0A
• B. 7.1A
• C. 10.0A
• D. 14.1A

A capacitor of capacitance 25μF is connected to an a.c. power source of frequency 200 Hz. Calculate the reactance of the capacitor

• A. 0.01
• B. 0.02
• C. 50.00
• D. 100.00

A cone in an unstable equilibrium has its potential energy

• A. decreased
• B. increased
• C. unchanged
• D. oscillating

An object is placed 10m from a pinhole camera of length 25cm. Calculate the linear magnification.

• A. 2.5x10²
• B. 2.5x10^-2
• C. 2.5x10^-1
• D. 2.5x10¹

The temperature at which the water vapor in the air saturates the air and begins to condense is known as

• A. dew point
• B. critical point
• C. boiling point
• D. triple point

Six dry cells each of e.m.f. 2.0 and internal resistance of 1.0\(\Omega\) are connected in parallel across a load of 3.0\(\Omega\). Calculate the effective current in the circuit.

• A. 0.63A
• B. 0.50A
• C. 0.31A
• D. 0.22A

The ice and steam points of a certain thermometer are -20^o and 100^o respectively. Calculate the Celsius temperature temperature corresponding to 70^o on the thermometer

• A. 84.0^o
• B. 75.0^o
• C. 64.0^o
• D. 58.0^o