1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
The most suitable reagent for the following conversion, is : NEET 2019 Chemistry - Hydrocarbons Question 15 English
A
Zn / HCl
B
Hg2+ / H+ , H2O
C
Na / liquid NH3
D
H2, Pd/C, quinoline
2
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
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 glycerin (which has the same refractive index (m = 1.5) as that of glass) then the equivalent focal length is F2. The ratio F1 : F2 will be :
A
1 : 2
B
2 : 3
C
3 : 4
D
2 : 1
3
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
The work done to raise a mass m from the surface of the earth to a height h, which is equal to the radius of the earth, is :
A
mgR
B
2mgR
C
$${1 \over 2}$$mgR
D
$${3 \over 2}$$mgR
4
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
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.