The horizontal rows of the periodic table are called ______?
The horizontal rows of the periodic table are called ______?
A. Groups
B. Periods
C. Sets
D. Matrices
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Among the planets of the Solar system the position of the Earth from the Sun is:_________?
Among the planets of the Solar system the position of the Earth from the Sun is:_________?
A. Second
B. Third
C. Fourth
D. SixthWhich one of the following represents a chemical change_________?
Which one of the following represents a chemical change_________?A. Sublimation of iodine
B. Heating a platinum wire in a Bunsen flame
C. Heating of mercuric oxide powder
D. Evaporation of alcoholA loudspeaker changes _________ energy into sound energy.
A loudspeaker changes _________ energy into sound energy.
A. Chemical
B. Electrical
C. Light
D. Kineticwhat are stars mainly made of ?
what are stars mainly made of ?
A. Balls of gass
B. Rock
C. Ice
D. Light1 Carat is equal to __________?
1 Carat is equal to __________?A. 0.2 g
B. 0.3 g
C. 0.4 g
D. 0.5 gClocks, which moves with the velocities comparable with the velocity of light, run ?
Clocks, which moves with the velocities comparable with the velocity of light, run ?A. fast
B. slow
C. equal to the velocity of light
D. with zero velocity