Planets do not twinkle because A. they emit light of a constant intensity B. their distance from the earth does not change with time C. they are very far away from the earth resulting in decrease in intensity of light D. they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable | General Knowledge | Funtimejokes.net

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Planets do not twinkle because A. they emit light of a constant intensity B. their distance from the earth does not change with time C. they are very far away from the earth resulting in decrease in intensity of light D. they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable

Question:- Metals are good conductors of electricity because A. they contain free electrons B. the atoms are lightly packed C. they have high melting point D. All of the above

Answer:- Option A

Question:- Let a thin capillary tube be replaced with another tube of insufficient length then, we find water A. will overflow B. will not rise C. depressed D. change its meniscus

Answer:- Option B

Question:- If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same A. velocity B. momentum C. acceleration D. kinetic energy

Answer:- Option B

Question:- Pick out the scalar quantity A. force B. pressure C. velocity D. acceleration

Answer:- Option B

Question:- Rectifiers are used to convert A. Direct current to Alternating current B. Alternating current to Direct current C. high voltage to low voltage D. low voltage to high voltage

Answer:- Option B

Question:- out of the following, which is not emitted by radioactive substance? A. Electrons B. Electromagnetic radiations C. Alpha particles D. Neutrons

Answer:- Option D

Question:- Sound waves in air are A. transverse B. longitudinal C. electromagnetic D. polarised

Answer:- Option B

Question:- Magnetism at the centre of a bar magnet is A. minimum B. maximum C. zero D. minimum or maximum

Answer:- Option C

Question:- It is more difficult to walk on a sandy road than on a concrete road because A. sand is soft and concreter is hard B. the friction between sand and feet is less than that between concrete and feet C. the friction between sand and feet is more than that between concrete and feet D. the sand is grainy but concrete is smooth

Answer:- Option B

Question:- Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2 A. 0.14 m/s B. 140 m/s C. 1.4 km/s D. 14 m/s

Answer:- Option D

Question:- Of the following properties of a wave, the one that is independent of the other is its A. amplitude B. velocity C. wavelength D. frequency

Answer:- Option A

Question:- Lux is the SI unit of A. intensity of illumination B. luminous efficiency C. luminous flux D. luminous intensity

Answer:- Option A

Question:- What is intensity illumination?

Answer:- The illumination intensity indicates the luminous flux which strikes a surface. The utilised unit of measure is lux: 1 lx = 1 lm/m² (lumens per square meters).

Question:- What are the units of intensity of light?

Answer:- Candela is the SI unit of intensity of light.