Laws of Motion & Friction · JEE Main previous year questions

2004 3 questions

1. Q762004 · 24 Apr 2004 · Shift 1

   Two masses $m_1=5\mathrm{kg}$ and $m_2=4.8\mathrm{kg}$ tied to a string are hanging over a light frictionless pulley. What is the acceleration of the masses when left free to move? $(g=9.8m/{\mathrm{s}}^2)$

   1. A.$5m/{\mathrm{s}}^2$
   2. B.$9.8m/{\mathrm{s}}^2$
   3. C.$0.2m/{\mathrm{s}}^2$
   4. D.$4.8m/{\mathrm{s}}^2$
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   Answer: C

2. Q772004 · 24 Apr 2004 · Shift 1

   A block rests on a rough inclined plane making an angle of $30^{\circ }$ with the horizontal. The coefficient of static friction between the block and the plane is $0.8$. If the frictional force on the block is $10\mathrm{N}$, the mass of the block (in $\mathrm{kg}$) is $(takeg=10m/{\mathrm{s}}^2)$

   1. A.$1.6$
   2. B.$4.0$
   3. C.$2.0$
   4. D.$2.5$
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   Answer: C

3. Q1342004 · 24 Apr 2004 · Shift 1

   A radiation of energy $E$ falls normally on a perfectly reflecting surface. The momentum transferred to the surface is

   1. A.$Ec$
   2. B.$2E/c$
   3. C.$E/c$
   4. D.$E/c^2$
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   Answer: B