1
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
The ratio of escape velocity at earth (ve) to the escape velocity at a planet (vp) whose radius and mean density are twice as that of earth is
A
1 : 4
B
1 : $$\sqrt 2 $$
C
1 : 2
D
1 : 2$$\sqrt 2 $$
2
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
At what height from the surface of earth the gravitation potential and the value of g are $$-$$5.4 $$ \times $$ 107 J kg$$-$$1 and 6.0 m s$$-$$2 respectively? Take the radius of earth as 6400 km.
A
1400 km
B
2000 km
C
2600 km
D
1600 km
3
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
A piece of ice falls from a height h so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h [Latent heat of ice is $$3.4 \times {10^5}$$ J/kg and g = 10 N/Kg]
A
136 km
B
68 km
C
34 km
D
544 km
4
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
Coefficient of linear expansion of brass and steel rods are $$\alpha $$1 and $$\alpha $$2. Lengths of brass and steel rods are $$l$$1 and $$l$$2 respectively. If ($$l$$1 $$-$$ $$l$$2) is maintained same at all temperatures, which one of the following relations holds good?
A
$$\alpha $$1$$l$$2 = $$\alpha $$2 2$$l$$1
B
$$\alpha $$1$$l$$1 = $$\alpha $$2l2
C
$$\alpha $$1$$l$$2 = $$\alpha $$2$$l$$1
D
$$\alpha $$1$$l$$22 = $$\alpha $$2$$l$$12
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