Other Physics · JEE Main previous year questions

2002 15 questions

1. Q1012002 · 27 Apr 2002 · Shift 1

   1 mole of a gas with $\gamma =7/5$ is mixed with $1$ mole of a gas with $\gamma =5/3$, then the value of $\gamma$ for the resulting mixture is

   1. A.$7/5$
   2. B.$2/5$
   3. C.$3/2$
   4. D.$12/7$
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   Answer: C

2. Q1022002 · 27 Apr 2002 · Shift 1

   Two spheres of the same material have radii $1\mathrm{m}$ and $4\mathrm{m}$ and temperatures $4000\mathrm{K}$ and $2000\mathrm{K}$ respectively. The ratio of the energy radiated per second by the first sphere to that by the second is

   1. A.$1:1$
   2. B.$16:1$
   3. C.$4:1$
   4. D.$1:9$
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   Answer: A

3. Q1082002 · 27 Apr 2002 · Shift 1

   Tube $A$ has both ends open while tube $B$ has one end closed, otherwise they are identical. The ratio of fundamental frequency of tube $A$ and $B$ is

   1. A.$1:2$
   2. B.$1:4$
   3. C.$2:1$
   4. D.$4:1$
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   Answer: C

4. Q1182002 · 27 Apr 2002 · Shift 1

   A wire when connected to $220\mathrm{V}$ mains supply has power dissipation $P_1$. Now the wire is cut into two equal pieces which are connected in parallel to the same supply. Power dissipation in this case is $P_2$. Then $P_2:P_1$ is

   1. A.$1$
   2. B.$4$
   3. C.$2$
   4. D.$3$
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   Answer: B

5. Q1222002 · 27 Apr 2002 · Shift 1

   If ${\theta }_i$ is the inversion temperature, ${\theta }_n$ is the neutral temperature, ${\theta }_c$ is the temperature of the cold junction, then

   1. A.${\theta }_i+{\theta }_c={\theta }_n$
   2. B.${\theta }_i-{\theta }_c=2{\theta }_n$
   3. C.$\frac{{\theta }_i+{\theta }_c}{2}={\theta }_n$
   4. D.${\theta }_c-{\theta }_i=2{\theta }_n$
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   Answer: C

6. Q1372002 · 27 Apr 2002 · Shift 1

   At absolute zero, Si acts as

   1. A.non-metal
   2. B.metal
   3. C.insulator
   4. D.none of these
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   Answer: C

7. Q1392002 · 27 Apr 2002 · Shift 1

   Formation of covalent bonds in compounds exhibits

   1. A.wave nature of electron
   2. B.particle nature of electron
   3. C.both wave and particle nature of electron
   4. D.none of these
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   Answer: A

8. Q1432002 · 27 Apr 2002 · Shift 1

   Which statement is incorrect?

   1. A.all reversible cycles have same efficiency
   2. B.reversible cycle has more efficiency than an irreversible one
   3. C.Carnot cycle is a reversible one
   4. D.Carnot cycle has the maximum efficiency in all cycles.
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   Answer: A