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1
Cryogenics is
A
a type of tank
B
study of materials and phenomena at low temperature
C
study of radioactive elements
D
none of the above
2
The heat received by a person sitting in front of a fire is due to which of the following mode(s) of heat of transfer?
A
only i and iii
B
ii only
C
iii only
D
only i and ii
3
1 Fermi is equal to
A
10-15 cm
B
10-15 m
C
10-12 m
D
10-10 m
4
The dimensional formula for modulus of rigidity is
A
M-1 L-2 T4
B
M2 L-2 T2
C
M-1 L-1 T3
D
M1 L-1 T-2
5
Susceptibility of a diamagnetic substance is
A
zero
B
small but positive
C
small and negative
D
very large
6
What is the angle through which cyclist should bend to avoid skidding during a turn?
A
cos-1 (v2 / rg)
B
tan-1 (v2 / rg)
C
tan-1 (v2 / 2rg)
D
cos-1 (v2 / rg)1/2
7
The elastic energy stored per unit volume of the material, when its young`s modulus Y is subjected to stress S is
A
SY/4
B
SY/2
C
S2 /2Y
D
2S/Y
8
What is the ratio of ionization energy of bohr`s hydrogen atom and hydrogen like lithium atom?
A
1/6
B
1/9
C
1/8
D
1/5
9
What will be the velocity after 6 seconds, if a 0.2kg object at rest is subjected to a force (0.3i - 0.4j)N?)
A
10i - 12j
B
9i - 12j
C
12i - 9j
D
12i - 10j
10
A radioactive element has a half-life period of 800 years. After 2400 years, what amount of the radioactive element will remain?
A
1/8
B
1/9
C
1/2
D
1/3