1
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

The escape velocity of a projectile on the earth's surface is 11.2 km/s. A body is projected out with thrice this speed. The speed of the body far away from the earth will be

A
22.4 km/s
B
31.7 km/s
C
33.6 km/s
D
None of these
2
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

Consider a compound slab consisting of two different materials having equal lengths, thickness and thermal conductivities K and 2K respectively. The equivalent thermal conductivity of the slab is

A
$$\sqrt2$$K
B
$$3$$K
C
$$\frac{4}{3}$$K
D
$$\frac{2}{3}$$K
3
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

A circular coil of 20 turns and radius 10 cm is placed in a uniform magnetic field of 0.10 T normal to the plane of the coil. If the current in the coil is 5 A, then the average force on each electron in the coil due to the magnetic field is

A
$$2.5\times10^{-25}$$ N
B
$$4.5\times10^{-25}$$ N
C
$$5\times10^{-25}$$ N
D
$$5.5\times10^{-25}$$ N
4
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

With what minimum acceleration can a fireman slide down a rope while breaking strength of the rope is $$\frac{2}{3}$$ of the weight?

A
$$\frac{2}{3}$$ g
B
g
C
$$\frac{1}{3}$$ g
D
zero
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