1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
A disc of radius 2 m and mass 100 kg rolls on a horizontal floor. Its centre of mass has speed of 20 cm/s. How much work is needed to stop it?
A
1 J
B
2 J
C
3 J
D
30 kJ
2
NEET 2019
MCQ (Single Correct Answer)
+4
-1
A small hole of area of cross-section 2 mm2 present near the bottom of a fully filled open tank of height 2 m. Taking g = 10 m/s2, the rate of flow of water through the open hole would be nearly :
A
8.9 × 10–6 m3/s
B
2.23 × 10–6 m3/s
C
6.4 × 10–6 m3/s
D
12.6 × 10–6 m3/s
3
NEET 2019
MCQ (Single Correct Answer)
+4
-1
A parallel plate capacitor of capacitance 20 $$\mu $$F is being charged by a voltage source whose potential is changing at the rate of 3V/s. The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively :
A
zero, zero
B
zero, 60 $$\mu $$A
C
60 $$\mu $$A, 60 $$\mu $$A
D
60 $$\mu $$A, zero
4
NEET 2019
MCQ (Single Correct Answer)
+4
-1
When an object is shot from the bottom of a long smooth inclined plane kept at an angle 60o with horizontal, it can travel a distance x1 along the plane. But when the inclination is decreased to 30o and the same object is shot with the same velocity, it can travel x2 distance. Then x1 : x2 will be :
A
1 : $$\sqrt 2 $$
B
$$\sqrt 2 $$ : 1
C
1 : $$\sqrt 3 $$
D
1 : 2$$\sqrt 3 $$
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