A) 11.2 km/sec

B) 18 km/sec

C) 35 km/sec

D) 21 km/sec

A) The heat generated by the flow of electrical current through the body

B) Radiation pulses of the electricity

C) All of the above

D) The high energy of electrons

A) to maintain the density of air constant

B) to make air a moderate supporter of combustion

C) to reduce the poisonous nature of ozone in air

D) to prevent the hydrogen in air from exploding

A) Isotopes

B) Isobars

C) None

D) Isotones

A) Wavelenth

B) Velocity

C) All the above

D) Frequency

A) Photovoltaic cell

B) Photodiode

C) Heliostats

D) Thermocouple

A) Mirages

B) Twinkling effect of stars

C) Bending of light while passing through a medium

D) Lateral inversion

A) Electrons will be added to an atom only if the orbitals are different colors.

B) Electrons will be added to an atom starting from the lowest possible level or sublevel.

C) Electrons will be added to an atom in a symmetrical manner.

D) Electrons will be added to an atom in a random order.

A) The force of friction that acts when a body is moving (sliding) on a surface is called sliding friction

B) Friction is the force which opposes the relative motion of two surfaces in contact

C) Rolling friction is much more than sliding friction, the use of ball bearings in a machine considerably reduces friction

D) Friction in machines wastes energy and also causes wear and tear

A) electrical potential energy

B) chemical potential energy

C) kinetic energy

D) gravitational potential energy

A) the opposite direction of the motion

B) the same direction as the motion

C) upward direction

D) all the directions

A) Neutron

B) Proton

C) Ion

D) Electron

A) Gasoline additive

B) Fire extinguisher

C) Pain killer

D) Mosquito repellent

A) Ag

B) W

C) Rh

D) Fe

A) The atoms share or transfer electrons

B) Two atoms fuse together to form a chemical bond

C) Like charges in the atoms cause them to stick together

D) A chemical bond forms when two atoms transfer or share protons to achieve a stable nucleus

A) normal

B) shear

C) strike-slip

D) reverse

A) Argon

B) Helium

C) Nitrogen

D) Neon

A) Alluminium

B) Magnesium

C) Copper

D) Lead

A) 32 degreees

B) 212 degrees

C) 0 degreees

D) -40 degreees

A) K.E of orderly motion of molecules

B) K.E of random motion of molecules

C) None of these

D) Total K.E of random and orderly motion of molecules