What causes the clean sky’s color to be blue?
A. Reflection of light
B. Refraction of light
C. Diffraction of light
D. Dispersion of light
What is the name of the apparatus that transforms mechanical energy into electrical energy?
A. Motor.
B. Transformer.
C. Coil.
D. Generator.
…takes up space and has mass.
A. Matter
B. Gravity
C. Energy
D. Plasma
Elements consist of only one kind of…?
A. Atoms
B. Molecules
C. H2O
D. Compounds
SI unit of time is:
A. second
B. kilo gram
C. meter
D. volt
Speed of light is…?
A. 280,000 km/s
B. 300,000 km/s
C. 320,000 km/s
D. none of these
Which planet in our solar system is significantly brighter?
A. Earth
B. Venus
C. Mercury
D. Jupiter
The kidneys’ primary purpose is….
A. to control blood pressure
B. to control body temperature
C. to remove waste from blood
D. to help in digestion of body
What type of energy is kept in a dam?
A. Kinetic energy
B. Electrical energy
C. Potential energy
D. None of these
Our body contains how many bones?
A. 102
B. 306
C. 206
D. 204