1
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
Change Language
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
2
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
Change Language
The molecules of a given mass of a gas have r.m.s. velocity of 2000 m s$$-$$1 at 27oC and 1.0 $$ \times $$ 105 N m$$-$$2 pressure. When the temperature and pressure of the gas are respectively, 127oC and 0.05 $$ \times $$ 105 N m$$-$$2, the r.m.s. velocity of its molecules in m s$$-$$1 is
A
$${{100\sqrt 2 } \over 3}$$
B
$${{100} \over 3}$$
C
$$100\sqrt 2 $$
D
$${{400} \over {\sqrt 3 }}$$
3
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
Change Language
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
4
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
Change Language
A uniform rope of length L and mass m1 hangs vertically from a rigid support. A block of mass m2 is attached to the free end of the rope. A transverse pulse of wavelength $$\lambda $$1 is produced at the lower end of the rope. The wavelength of the pulse when it reaches the top of the rope is $$\lambda $$2. The ratio $$\lambda $$2/$$\lambda $$1 is
A
$$\sqrt {{{{m_2}} \over {{m_1}}}} $$
B
$$\sqrt {{{{m_1} + {m_2}} \over {{m_1}}}} $$
C
$$\sqrt {{{{m_1}} \over {{m_2}}}} $$
D
$$\sqrt {{{{m_1} + {m_2}} \over {{m_2}}}} $$