A. Refrigeration
B. Aerosol spray
C. Plastic foam industry
D. All of above
Related Mcqs:
- Geiger counter is suitable for _________________?
A. Fast counting
B. Extremely fast counting
C. Slow counting
D. All situations - The current through a metallic conductor is due to the motion of _________________?
A. free electrons
B. protons
C. neutrons
D. still under controversy - Production of heat due to an electric current flowing through a conductor is given by _________________?
A. Joule effect
B. Joule Thomsons effect
C. Comptons effect
D. Feed back effect - A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part _________________?
A. remains the same
B. is doubled
C. is halved
D. becomes zero - In a plane polarized light _________________?
A. vibration in all direction
B. vibration in two mutually perpendicular directions
C. vibration take place in a direction perpendicular to the direction of propagation of light
D. no vibration at all - If a body a mass of 2 kg is raised vertically through 2m, then the work done will be _________________?
A. 38.2 J
B. 392.1 J
C. 39.2 J
D. 3.92 J - Energy needed to magnetize and demagnetize is represented by _________________?
A. Hysteresis curve
B. Hysteresis loop area
C. Hysteresis loop
D. Straight line - Hydrogen atom does not emit X-rays because _________________?
A. its energy levels are too close to each other
B. its energy levels are too far apart
C. it is too small in size
D. it has a single electron - The charge on an electron was determine by ________________?
A. Ampere
B. Maxwell
C. Millikan
D. Thomson - X-rays are electromagnetic waves like________________?
A. Light waves
B. Heat waves
C. Microwaves
D. γ-rays
