Thunder is usually heard some seconds after lightning is observed because
Thunder is usually heard some seconds after lightning is observed because A. the human eye is more sensitive…
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Which of the following statements is not correct about long sight?
Which of the following statements is not correct about long sight? A. A Iong-sighted person can see distant…
The amplitude of a wave is the
The amplitude of a wave is the A. distance between two successive troughs of the wave B. separation…
The refractive index of glass for yellow light is greater than that for red light…
The refractive index of glass for yellow light is greater than that for red light because yellow light…
The real image of an object formed by a converging lens of focal length 15cm,…
The real image of an object formed by a converging lens of focal length 15cm, is three times…
The air column in a resonance tube is set into resonance by a vibrating tuning…
The air column in a resonance tube is set into resonance by a vibrating tuning fork. The resultant…
The image of an object is located 6cm behind a convex mirror. If its magnification…
The image of an object is located 6cm behind a convex mirror. If its magnification is 0.6, calculate…
Calculate the power rating of an immersion heater used for 10 minutes to increase the…
Calculate the power rating of an immersion heater used for 10 minutes to increase the temperature of 10kg…
A ray of light is incident on ‘a plane mirror at an angle of 20o….
A ray of light is incident on ‘a plane mirror at an angle of 20o. This mirror is…
Calculate the heat energy required to change 0.1kg of ice at 0oC to water boiling…
Calculate the heat energy required to change 0.1kg of ice at 0oC to water boiling at 100oC. (Specific…