physics

When a girl moves towards a plane mirror at a speed of 4.0m/s, the distance between the girl & her image reduces a speed of?

A. 2 m/s B. 4 m/s C. 8 m/s D. 12 m/s Correct Answer: Option C C. 8 m/s

6 years ago

Water and Kerosine are drawn respectively into the two limbs of a Hare’s apparatus. The destiny of water is 1.0gcm−3 and the density of kerosine is 0.80gcm−3. If the height of the water column is 20.0cm, calculate the height of the kerosine column.

A. 1.6cm B. 16.0cm C. 20.0cm D. 25.0cm Correct Answer: Option D Explanation Devices with different liquids d1h1 = d2h2…

6 years ago

In semi-conductor, the carriers of current at room temperature are?

A. electrons only B. electrons and holes C. holes only D. electron and ions Correct Answer: Option B Explanation Electron…

6 years ago

An a.c of 1A at a frequency of 800 cycles per second flows through a coil, the inductance of which is 2.5mH and the resistance of which is 5Ω. What is the power absorbed in the Coil?

A. 5W B. 6W C. 7W D. 8W Correct Answer: Option A A. 5W  

6 years ago

Three resistors with resistance 200Ω, 500Ω and 1kΩ are connected in series. A 6v battery is connected to either end of the combination. Calculate the potential difference between the ends of 200Ω resistance.

A. 0.71V B. 0.7V C. 0.82V D. 0.8V Correct Answer: Option A A. 0.71V

6 years ago

The mass of a nucleus is the?

A. total number of its proton & neutrons B. number of its protons C. mass of its electrons D. total…

6 years ago

Neutrons were discovered by?

A. Faraday B. Dalton C. James Chadwick D. Rutherford Correct Answer: Option C C. James Chadwick Explanation It was discovered…

6 years ago

Gases conduct electricity under?

A. high pressure & high voltage B. low pressure & low voltage C. normal pressure & low voltage D. low…

6 years ago

A man on a bench will exert the greatest pressure on the bench when he?

A. lies flat on his back B. lies flat on his belly C. stands on both feet D. stands on…

6 years ago

A siren having a ring of 200 hole makes 132 rev/min. A jet of air is directed on the set of holes. Calculate the frequency and wavelength in air of the note produced (take v = 350m/s)

A. 0.875m B. 0.625m C. 0.335m D. 0.125m Correct Answer: Option A A. 0.875m

6 years ago
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