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2002 15 questions

Q762002 · 27 Apr 2002 · Shift 1
If a body loses half of its velocity on penetrating $3 cm$ in a wooden block, then how much will it penetrate more before coming to rest?
1. A. $1 cm$
2. B. $2 cm$
3. C. $3 cm$
4. D. $4 cm$
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Answer: A
Q782002 · 27 Apr 2002 · Shift 1
When forces $F_{1}, F_{2}, F_{3}$ are acting on a particle of mass $m$ such that $F_{2}$ and $F_{3}$ are mutually perpendicular, then the particle remains stationary. If the force $F_{1}$ is now removed then the acceleration of the particle is
1. A. $F_{1} / m$
2. B. $F_{2} F_{3} / m F_{1}$
3. C. $(F_{2} - F_{3}) / m$
4. D. $F_{2} / m$
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Answer: A
Q792002 · 27 Apr 2002 · Shift 1
Two forces are such that the sum of their magnitudes is $18 N$ and their resultant is $12 N$ which is perpendicular to the smaller force. Then the magnitudes of the forces are
1. A. $12 N, 6 N$
2. B. $13 N, 5 N$
3. C. $10 N, 8 N$
4. D. $16 N, 2 N$ .
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Answer: B
Q802002 · 27 Apr 2002 · Shift 1
Speeds of two identical cars are $u$ and $4 u$ at the specific instant. The ratio of the respective distances in which the two cars are stopped from that instant is :
1. A. $1 : 1$
2. B. $1 : 4$
3. C. $1 : 8$
4. D. $1 : 16$
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Answer: D
Q912002 · 27 Apr 2002 · Shift 1
Energy required to move a body of mass $m$ from an orbit of radius $2 R$ to $3 R$ is
1. A. $\frac{GM m}{12 R ^{2}}$
2. B. $\frac{GM m}{3 R ^{2}}$
3. C. $\frac{GM m}{8 R}$
4. D. $\frac{GM m}{6 R}$
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Answer: D
Q952002 · 27 Apr 2002 · Shift 1
Heat given to a body which raises its temperature by $1^{\circ} C$ is
1. A.water equivalent
2. B.thermal capacity
3. C.specific heat
4. D.temperature gradient
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Answer: B
Q1002002 · 27 Apr 2002 · Shift 1
At what temperature is the $r . m . s$ velocity of a hydrogen molecule equal to that of an oxygen molecule at $4 7^{\circ} C$ ?
1. A. $80 K$
2. B. $- 73 K$
3. C. $3 K$
4. D. $20 K$
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Answer: D
Q1012002 · 27 Apr 2002 · Shift 1
1 mole of a gas with $γ = 7/5$ is mixed with $1$ mole of a gas with $γ = 5/3$ , then the value of $γ$ 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
Q1022002 · 27 Apr 2002 · Shift 1
Two spheres of the same material have radii $1 m$ and $4 m$ and temperatures $4000 K$ and $2000 K$ 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
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
Q1182002 · 27 Apr 2002 · Shift 1
A wire when connected to $220 V$ 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
Q1222002 · 27 Apr 2002 · Shift 1
If $θ_{i}$ is the inversion temperature, $θ_{n}$ is the neutral temperature, $θ_{c}$ is the temperature of the cold junction, then
1. A. $θ_{i} + θ_{c} = θ_{n}$
2. B. $θ_{i} - θ_{c} = 2 θ_{n}$
3. C. $\frac{θ _{i} + θ _{c}}{2} = θ_{n}$
4. D. $θ_{c} - θ_{i} = 2 θ_{n}$
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Answer: C
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
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
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