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Exercise

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Planets are

A. luminous heavenly bodies revolving around a star
B. non-luminous heavenly bodies
C luminous heavenly bodies that twinkle
D. luminous heavenly bodies that do not twinkle

Natural radioactivity was discovered by

A. Marie Curie
B. Ernest Rutherfor
C Henri Becquerel
D. Enrico Fermi

Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this? Diffusion Refraction Internal reflection

A. I, II and III
B. I and II
C II and III
D. I and III

One should not connect a number of electrical appliances to the same power socket because

A. this can damage the appliances due to overloading
B. this can damage the domestic wiring due to overloading
C this can damage the electrical meter
D. the appliance will not get full voltage

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Large astronomical telescopes always use as objective

A. lens
B. mirror
C combinations of lenses
D. None of the above

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