1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
For a p-type semiconductor, which of the following statements is true?
A
Holes are the majority carriers and trivalent atoms are the dopants.
B
Holes are the majority carriers and pentavalent atoms are the dopants.
C
Electrons are the majority carriers and pentavalent atoms are the dopants
D
Electrons are the majority carriers and trivalent atoms are the dopants.
2
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Two point charges A and B, having charges +Q and – Q respectively, are placed at certain distance apart and force acting between them is F. If 25% charge of A is transferred to B, then force between the charges becomes :
A
F
B
$${{16F} \over 9}$$
C
$${{9F} \over {16}}$$
D
$${{4F} \over 3}$$
3
NEET 2019
MCQ (Single Correct Answer)
+4
-1
$$\alpha $$-particale consists of :
A
2 electrons, 2 protons and 2 neutrons
B
2 electrons and 4 protons only
C
2 protons only
D
2 protons and 2 neutrons only
4
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Body A of mass 4m moving with speed u collides with another body B of mass 2 m, at rest. The collision is head on and elastic in nature. After the collision the fraction of energy lost by the colliding body A is :
A
$${5 \over 9}$$
B
$${4 \over 9}$$
C
$${8 \over 9}$$
D
$${1 \over 9}$$
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