What type of electromagnetic radiation can be used to take photographs in the haze?

• A. Radio waves
• B. infrared rays
• C. Visible light
• D. Gamma rays

An alternating current can induce voltage because it has

• A. ripple value
• B. varying magnetic field
• C. weaker magnetic field than direct current
• D. high peak value

I Electrical potential, II Torque, III Kinetic Energy, IV Momentum. Which of the quantities listed are vectors?

• A. II and IV
• B. I and II
• C. I and III
• D. II and III

(a) Explain the statement the acceleration of free fall cohesion.

(b) State two factors that can affect the value of the narrow glass tube has a concave meniscus while acceleration of free fall at a place.

A magnetic needle is suspended first at the earth's north magnetic pole and then at a point on the magnetic equator. The respective angles between the needle and the horizontal are

• A. 0^o and 0^o
• B. 60^o and 60^o
• C. 90^o and 90^o
• D. 90^o and 0^o

A 2H inductor has negligible resistance and is connected to a \(\frac{50}{\pi}\) Hz A.C supply. The reactance of the inductor is?

• A. 200\(\Omega\)
• B. 50\(\Omega\)
• C. \(\frac{100}{\pi}\)
• D. \(\frac{25}{\pi \Omega}\)

When two notes of nearly equal frequencies are sounded together, a periodic rise and fall in sound intensity can be heard. This phenomenon can be called

• A. beats
• B. diffraction
• C. overtones
• D. resonance

A loaded spring performs simple harmonic motion with an amplitude of 5cm. If the maximum acceleration of the load is 20cm s^-1, calculate the angular frequency of the motion

• A. 2 rad s^-1
• B. 4 rad s^-1
• C. 5 rad s^-1
• D. 10 rad s^-1

In the clinical thermometer, the function of the kink is to i. Prevent the back flow of mercury after use. ii. Ensure the back flow of mercury after use. iii. Maintain the thermometric property of mercury. iv. Allow the temperature attained to be read.

• A. i only
• B. i and ii only
• C. i and iv only
• D. iii and iv only

Which of the following statements about solid friction is/are correct? I. Friction depends on the nature of the surfaces in contact II. Friction depends on the area of contact III. Friction always acts in the direction of motion.

• A. I only
• B. II only
• C. III only
• D. I and II only