Which of the following statements about photoelectrons is correct?

• A. A faint green light produces photoelectrons with less kinetic energy than a bright red light
• B. A red light releases a smaller number of electrons than a green light
• C. A faint green light produces photoelectrons with greater kinetic energy than a bright red light
• D. A red light produces more photoelectrons than a green light

A transverse wave can be distinguished from a longitudinal wave by

• A. diffraction
• B. reflection
• C. refraction
• D. polarization

Which of the following liquid is a poor conductor of electricity?

• A. molten mercury
• B. molten steel
• C. molten iron
• D. molten copper

The walls and ceilings of many standard auditoria are covered with perforated pads to

• A. increase the intensity of sound waves
• B. increase the loudness of sound waves
• C. reduce the effect of reverberations of sound waves
• D. increase the interference effect of sound waves

A cell of emf 1.5V is connected in series with a 1Ω resistor and a current of 0.3A flows through the resistor. Find the internal resistance of the cell

• A. 4.0Ω
• B. 3.0Ω
• C. 1.5Ω
• D. 1.0Ω

In the diagram below, a bulb is lit by drawing 2.0A from 440V a.c. source. Calculate the cost of keeping the bulb on for two days at $0.40 per kilowatt-hour .

• A. $16.90
• B. $84.48
• C. $1690.00
• D. $8.48

A boy sits in a train moving with uniform speed on a straight track. If from his outstretched palm he gently tosses his coin upwards, the coin will fall

• A. in front of his palm
• B. behind his palm
• C. beside his palm
• D. into his palm

Which of the following is a fundamental quantity?

• A. Heat capacity
• B. Electric current
• C. Torque
• D. Reactance

What must be the distance between an object and a converging lens of focal length 20cm to produce an erect image two times the object height?

• A. 20cm
• B. 15cm
• C. 10cm
• D. 5cm

What is the least possible error encountered when taking measurement with a meter rule?

• A. 0.1mm
• B. 1.0mm
• C. 0.5mm
• D. 0.2mm