1
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Let there be an object having some chemicals in it. It starts moving with a uniform velocity v and a chemical reaction starts happening. In this case, which of the following statement(s) is/are correct?

1. Chemical reactions happening in the system cannot change the velocity (v) of the centre of mass of the object.

2. Chemical reactions happening in the system cannot change kinetic energy of the particles inside with respect to the centre of mass of object.

Select the correct answer using the code given below :
A
Only 1
B
Only 2
C
Both 1 and 2
D
Neither 1 nor 2
2
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following compounds does not exhibit a different oxidation number of the same element?
A
Pb3O4
B
Fe3O4
C
Fe2O3
D
Mn3O4
3
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following statements about glass is not correct?
A
Glass is often said to be a supercooled liquid.
B
Glass has no definite melting point.
C
Soda glass is harder than pyrex glass.
D
Boron is present in pyrex glass.
4
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following statements is correct?
A
Both boiling and evaporation are surface phenomena.
B
Boiling is a surface phenomenon, but evaporation is a bulk phenomenon.
C
Both boiling and evaporation are bulk phenomena.
D
Boiling is a bulk phenomenon, but evaporation is a surface phenomenon.
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12