811. Subatomic particles (electron, proton. neutron) are made up of
A. photons
B. molecules
C. elements
D. quarks

812. 1 mile = _____ kilometer
A. 1.209
B. 1.409
C. 1.609
D. 1.809

813. Which from the following radiations possesses high ionizing power?
A. Alpha rays
B. Beta rays
C. Gamma rays
D. None of these

814. An element is identified by the number of _____ in its _____.
A. protons, nucleus
B. neutrons, nucleus
C. electrons, atom
D. positrons, atom

815. The attractive force that binds protons and neutrons in nucleus of an atom is known as
A. Coulomb force
B. electromagnetic force
C. nuclear force
D. electromotive force

816. The speed of light in air is
A. 2.8×106 m/s
B. 2.8×108 m/s
C. 3.0×106 m/s
D. 3.0×108 m/s

817. The speed of light in water is
A. 2.26×106 m/s
B. 2.26×108 m/s
C. 2.86×106 m/s
D. 2.86×108 m/s

818. Which device is often used to smooth out the sudden variations in line voltage?
(A) Breaker
(B) Capacitor
(C) Resistor
(D) Switch

819. The dimension of Momentum is
B. LT–1
C. MLT–1
D. MLT–2

820. The SI unit of heat is
A. joule
B. ohm
C. volt
D. Newton