1
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is $$-$$20oC, the temperature of the surroundings to which it rejects heat is
A
11oC
B
21oC
C
31oC
D
41oC
2
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Two vessels separately contain two ideal gases A and B at the same temperature, the pressure of A being twice that of B. Under such conditions, the density of A is found to be 1.5 times the density of B. The ratio of molecular weight of A and B is
A
2
B
$${1 \over 2}$$
C
$${2 \over 3}$$
D
$${3 \over 4}$$
3
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
A particle is executing a simple harmonic motion. Its maximum acceleration is $$\alpha $$ and maximum velocity is $$\beta $$. Them, its time period of vibration will be
A
$${{{\beta ^2}} \over \alpha }$$
B
$${{2\pi \beta } \over \alpha }$$
C
$${{{\beta ^2}} \over {{\alpha ^2}}}$$
D
$${\alpha \over \beta }$$
4
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
A string is stretched between fixed points separated by 75.0 cm. It is observed to have resonant frequencies of 420 Hz and 315 Hz. There are no other resonant frequencies between these two. The lowest resonant frequency for this string is
A
10.5 Hz
B
105 Hz
C
155 Hz
D
205 Hz
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