A household refrigerator is rated 200 watts. If electricity costs 5k per kWh, what is…
A household refrigerator is rated 200 watts. If electricity costs 5k per kWh, what is the cost of…
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A spectrum of sunlight is said to be impure when
A spectrum of sunlight is said to be impure when A. it is made of only three colours…
A cell of internal resistance 2 ohms supplies current to a 6 ohms resistor. The…
A cell of internal resistance 2 ohms supplies current to a 6 ohms resistor. The efficiency of the…
Which of the following phenomena explains the formation of a mirage? i. Reflection ii. Refraction…
Which of the following phenomena explains the formation of a mirage? i. Reflection ii. Refraction iii. Diffraction A.…
When white light is dispersed by a spectrometer, the component having the shortest wavelength is
When white light is dispersed by a spectrometer, the component having the shortest wavelength is A. orange B.…
Which of the following statement is TRUE of ultraviolet, visible and infra-red rays?
Which of the following statement is TRUE of ultraviolet, visible and infra-red rays? A. they are all electromagnetic…
To obtain a magnification of 2.5, how far should an object be placed from the…
To obtain a magnification of 2.5, how far should an object be placed from the pole of a…
An object is placed 10cm in front of a concave mirror of focal length 15cm….
An object is placed 10cm in front of a concave mirror of focal length 15cm. What is the…
A slight loading of a tuning fork has the effect of
A slight loading of a tuning fork has the effect of A. decreasing its amplitude B. increasing its…
Two strings of the same length and under the same tension gives notes of frequencies…
Two strings of the same length and under the same tension gives notes of frequencies in the ratio…