Laws of Motion & Friction · JEE Main previous year questions

2002 6 questions

1. Q772002 · 27 Apr 2002 · Shift 1

   A lift is moving down with acceleration $a$. A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively

   1. A.$g,g$
   2. B.$g-a,g-a$
   3. C.$g-a,g$
   4. D.$a,g$
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   Answer: C

2. Q812002 · 27 Apr 2002 · Shift 1

   A light string passing over a smooth light pulley connects two blocks of masses $m_1$ and $m_2$ (vertically). If the acceleration of the system is $g/8$, then the ratio of the masses is

   1. A.$8:1$
   2. B.$9:7$
   3. C.$4:3$
   4. D.$5:3$
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   Answer: B

3. Q822002 · 27 Apr 2002 · Shift 1
   
   1. A.$9.2$
   2. B.$9.8$
   3. C.$4$
   4. D.$7.8$
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   Answer: D

4. Q942002 · 27 Apr 2002 · Shift 1

   One end of a mass-less rope, which passes over a mass-less and friction-less pulley $P$ is tied to a hook $C$ while the other end is free. Maximum tension that the rope can bear is $360\mathrm{N}$. With what value of maximum safe acceleration (in $\mathrm{m}{\mathrm{s}}^{-2}$) can a man of $60\mathrm{kg}$ climb on the rope?

   1. A.$16$
   2. B.$6$
   3. C.$4$
   4. D.$8$
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   Answer: C

5. Q1072002 · 27 Apr 2002 · Shift 1

   length of a string tied to two rigid supports is $40\mathrm{cm}$. Maximum length (wavelength in $\mathrm{cm}$) of a stationary wave produced on it is

   1. A.$20$
   2. B.$80$
   3. C.$40$
   4. D.$120$
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   Answer: B

6. Q1102002 · 27 Apr 2002 · Shift 1

   A wave $y=a\sin (\omega t-kx)$ on a string meets with another wave producing a node at $x=0$. Then the equation of the unknown wave is

   1. A.$y=a\sin (\omega t+kx)$
   2. B.$y=-a\sin (\omega t+kx)$
   3. C.$y=a\sin (\omega t-kx)$
   4. D.$y=-a\sin (\omega t-kx)$
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   Answer: B