(NEET-2019) NTA Solutions (4):-
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Answer
For a P type semiconductor which of the following statements is true ? (1)Electrons are the majority carriers and trivalent atoms are the dopants. (2)Holes are the majority carriers and trivalent atoms are the dopants. (3)Holes are the majority carriers and pentavalent atoms are the dopants. (4)Electrons are the majority carriers and pentavalent atoms are the dopants.
(NEET-2019) NTA Solutions (2):- Answer(2) Sol. In p-type semiconductor, an intrinsic semiconductor is doped with trivalent impurities, that creates deficiencies
A body weighs 200 N on the surface of the earth. How much will it weigh half way down to the centre of the earth ? (1)150 N (2)200 N (3)250 N (4)100 N
(NEET-2019) NTA Solutions (2):-
A body weighs 200 N on the surface of the earth. How much will it weigh half way down to the centre of the earth ? (1)150 N (2)200 N (3)250 N (4)100 N
(NEET-2019) NTA Solutions (4):-
Pick the wrong answer in the context with rainbow. (1)When the light rays undergo two internal reflections in a water drop, a secondary rainbow is formed (2)The order of colours is reversed in the secondary rainbow (3)An observer can see a rainbow when his front is towards the sun (4)Rainbow is a combined effect of dispersion refraction and reflection of sunlight
(NEET-2019) NTA Solutions (3):- Answer(3) Sol. Rainbow can’t be observed when observer faces towards sun.
Increase in temperature of a gas filled in a container would lead to : (1)Increase in its mass (2)Increase in its kinetic energy (3)Decrease in its pressure (4)Decrease in intermolecular distance
(NEET-2019) NTA Solutions (2):-
Two similar thin equi-convex lenses, of focal length f each, are kept coaxially in contact with each other such that the focal length of the combination is F1. When the space between the two lenses is filled with glycerine (which has the same refractive index (μ = 1.5) as that of glass) then the equivalent focal length is F2. The ratio F1 : F2 will be : (1)2 : 1 (2)1 : 2 (3)2 : 3 (4)3 : 4
(NEET-2019) NTA Solutions (2):- Answer(2)
A disc of radius 2 m and mass 100 kg rolls on a horizontal floor. Its centre of mass has speed of 20 cm/s. How much work is needed to stop it? (1)3 J (2)30 kJ (3)2 J (4)1 J
(NEET-2019) NTA Solutions (1):- Answer(1)
Which colour of the light has the longest wavelength? (1)Red (2)Blue (3)Green (4)Violet
(NEET-2019) NTA Solutions (1):- Answer(1) Sol. Red has the longest wavelength among the given options.
Q. In which of the following devices the eddy current effect is not used? (1)Induction furnace (2)Magnetic braking in train (3)Electromagnet (4)Electric heater
(NEET-2019) NTA Solutions (4):- Answer(4) Sol. Electric heater does not involve Eddy currents. It uses Joule’s heating effect.
