Other Physics · JEE Main previous year questions

2009 5 questions

1. Q322009 · 27 Apr 2009 · Shift 1

   A particle has an initial velocity $3\hat{i}+4\hat{j}$ and an acceleration of $0.4\hat{i}+0.3\hat{j}$. Its speed after 10 s is:

   1. A.$7\sqrt{2}\mathrm{units}$
   2. B.$7\mathrm{units}$
   3. C.$8.5\mathrm{units}$
   4. D.$10\mathrm{units}$
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   Answer: A

2. Q342009 · 27 Apr 2009 · Shift 1

   The height at which the acceleration due to gravity becomes $\frac{g}{9}$ (where $g=$ the acceleration due to gravity on the surface of the earth) in terms of $R$, the radius of the earth, is:

   1. A.$\frac{R}{\sqrt{2}}$
   2. B.$R/2$
   3. C.$\sqrt{2}R$
   4. D.$2R$
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   Answer: D

3. Q352009 · 27 Apr 2009 · Shift 1

   Two wires are made of the same material and have the same volume. However wire 1 has cross-sectional area $A$ and wire 2 has cross-sectional area $3A$. If the length of wire 1 increases by $\Delta x$ on applying force $F$, how much force is needed to stretch wire 2 by the same amount?

   1. A.$4F$
   2. B.$6F$
   3. C.$9F$
   4. D.$F$
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   Answer: C

4. Q382009 · 27 Apr 2009 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: A

5. Q492009 · 27 Apr 2009 · Shift 1
   
   1. A.The forces on $AD$ are $BC$ are zero.
   2. B.The magnitude of the net force on the loop is given by $\frac{I_{1}I}{4\pi }{\mu }_0[2(b-a)+\pi /3(a+b)]$.
   3. C.The magnitude of the net force on the loop is given by $\frac{{\mu }_{0}I{I}_1}{24ab}(b-a)$.
   4. D.The forces on $AB$ and $DC$ are zero.
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   Answer: A