1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
A mass m is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when :
A
the wire is horizontal
B
inclined at an angle of 60o from vertical
C
the mass is at the lowest point
D
the mass is at the highest point
2
NEET 2019
MCQ (Single Correct Answer)
+4
-1
A copper rod of 88 cm and an aluminium rod of unknown length have their increase in length independent of increase in tmperature. The length of aluminium rod is : ($$\alpha $$Cu = 1.7 × 10–5 K–1 and $$\alpha $$Al = 2.2 × 10–5 K–1)
A
119.9 cm
B
88 cm
C
68 cm
D
6.8 cm
3
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Two particles A and B are moving in uniform circular motion in concentric circles of radii rA and rB with speed vA and vB respecitively. Their time period of rotation is the same. The ratio of angular speed of A to that of B will be :
A
vA : vB
B
1 : 1
C
rB : rA
D
rA : rB
4
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Ionized hydrogen atoms and $$\alpha $$-particles with same momenta enters perpendicular to a constant magnetic field, B. The ratio of their radii of their paths rH : r$$\alpha $$ will be :
A
1 : 2
B
4 : 1
C
1 : 4
D
2 : 1
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