In the network shown above, determine the potential difference across the 5μF capacitor

• A. 3V
• B. 6V
• C. 12V
• D. 18V

Which of the following could be effectively used to reduce friction?

• A) kerosene
• B) grease
• C) water
• D) petrol

(a) what is Brownian motion?

(b) State the two inferences that can be drawn from Brownian motion experiment.

The fundamental frequency of a plucked wire under a tension of 400N is 250Hz. When the frequency is changed to 500 Hz at constant length, the tension is

• A) 1600N
• B) 400N
• C) 160N
• D) 40N

A 12V battery has an internal resistance of 0.5W.If a cable of 1.0W resistance is connected across the two terminals of the battery, the current drawn from the battery is

• A. 16.0A
• B. 8.0A
• C. 0.8A
• D. 0.4A

A man standing 2 m from a charcoal fire is warmed mainly by

• A) convection
• B) radiation
• C) refraction
• D) conduction

The silvered surface in a vacuum flask reduces heat loos due to

• A. conduction
• B. convection
• C. radiation
• D. evaporation

Opening in the eye through which light passes to the retina is called the?

• A. pupil
• B. cornea.
• C. iris
• D. optic nerve.

The density P of a spherical ball of diameter d and mass m is given by

• A. P = \(\frac{3m}{4 \pi d^3}\)
• B. p = 4\(\pi md^3\)
• C. p = \(\frac{6m}{\pi d^3}\)
• D. p = \(\frac{3m}{2 \pi d^3}\)

The distance between a concave mirror and an object placed in front of it is 1.0m. If the raduis of curvature of the mirror is 4.0m, the image formed will be

• A. 2.00m behind the mirror
• B. 2.00m in front of the mirror
• C. 1.25m in front of the mirror
• D. 1.25m behind the mirror