The diagram below shows a plank RS pivoted its center of gravity O and is in equilibrium with the weight P and Q. If a weight 2P is added to P the plank will be in equilibrium again by

• A) moving Q nearer to O
• B) moving P nearer to O
• C) addding a weight Q to Q
• D) moving P further away from O

Two inductors of inductances 5 mll and 15 mll are connected in series and a current of 5A flows through them. the total energy stored in the inductor is

• A) 500.0J
• B) 250.0J
• C) 62.5J
• D) 50.0J

In a ripple tank experiment, a vibrating plate is used to generate ripples in the water. If the distance between two successive troughs is 3.5 cm and the wave travels a distance of 31.5 cm in 1.5 s, calculate the frequency of the vibrator

• A. 3.0Hz
• B. 6.0Hz
• C. 12.0Hz
• D. 27.0Hz

The component of vector X along the direction of vector Y is zero when

• A) X and Y are in opposite directions to each other
• B) X is at an angle of 45° to Y
• C) X is perpendicular to Y
• D) X and Y are parallel to each other

Which of the following is correct about light and sound waves?

• A. Both of them are associated with energy transfer
• B. Both of them need material media for propagation
• C. they are both longitudinal waves
• D. their velocities in air are equal

Find the work done in moving a 2 C charge between two points X and Y in an electric field if the potential difference is 100 volts

• A. 50J
• B. 100J
• C. 200J
• D. 400J

When two like charges are brought together, the potential energy of the system formed will

• A. increase because work is done against the field
• B. increase because work is done by the field
• C. decrease because work is done by the field
• D. decrease because work is done against the field

A quantity of hot water at 100^oC is added to 400g of water at 10^oC until the temperature of the mixture is 60^oC.

Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg^-1 K^-1]

• A. 200g
• B. 320g
• C. 400g
• D. 500g

In the electrical method of magnetisation, the polarity of the magnet depends on the

• A. amount of current passed
• B. direction of current
• C. magnetic material used
• D. size of the magnetic material

The period of oscillation pf a particle executing simple harmonic motion is 4? π seconds. If the amplitude of oscillation is 3.0m. Calculate its period

• A. 1.5ms^-1
• B. 3.0ms^-1
• C. 4.5ms^-1
• D. 6.0ms^-1