physics

The change of the direction of a wave-front because of a change in the velocity of the wave in another medium is called?

A. refraction B. reflection C. diffraction D. interference E. dispersion Correct Answer: Option C - diffraction

5 years ago

The ability of the eye to focus objects at different distances is called?

A. power B. accommodation C. normal vision D. persistence of vision E. long sight Correct Answer: Option B - accommodation

5 years ago

Which of the following statements is/are not correct about image formed by a plane mirror?

I. The magnification produced is 1 II. The image distance is same as the object distance III. The image is…

5 years ago

Which of the following will affect the saturation vapour pressure of a liquid?

A. Temperature of the liquid B. Humidity of air C. Volume of vapour D. Volume of the liquid E. mass…

5 years ago

Which of the following instrument may be used to measure the relative humidity?

A. Hydrometer B. Barometer C. Manometer D. Hypsometer E. Hygrometer Correct Answer: Option E - Hygrometer

5 years ago

The temperature at which the water vapour present in the air is just sufficient to saturate it is called the?

A. ice point B. boiling point C. steam point D. dew point E. saturation point Correct Answer: Option D -…

5 years ago

Which of the following statements about radiant heat is/are not correct?

I. radiant heat cannot travel through a vacuum II. rough surfaces emit radiant heat more than polished surfaces III. Dark…

5 years ago

Which of the following best explains a person suffers more severe burns when his skin is exposed to steam than when boiling water is poured onto his skin?

A. steam is at a higher temperature than boiling water B. steam posses greater heat energy per unit-mass than boiling…

5 years ago