Work, Energy & Power · JEE Main previous year questions

2009 6 questions

1. Q392009 · 27 Apr 2009 · Shift 1
   
   1. A.$300R$
   2. B.$400R$
   3. C.$500R$
   4. D.$200R$
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   Answer: B

2. Q402009 · 27 Apr 2009 · Shift 1
   
   1. A.$+414R$
   2. B.$-690R$
   3. C.$+690R$
   4. D.$-414R$
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   Answer: A

3. Q412009 · 27 Apr 2009 · Shift 1
   
   1. A.$276R$
   2. B.$1076R$
   3. C.$1904R$
   4. D.zero
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   Answer: A

4. Q442009 · 27 Apr 2009 · Shift 1

   Two points $P$ and $Q$ are maintained at the potentials of $10V$ and $-4V$, respectively. The work done in moving 100 electrons from $P$ to $Q$ is :

   1. A.$9.60\times 10^{-17}J$
   2. B.$-2.24\times 10^{-16}J$
   3. C.$2.24\times 10^{-16}J$
   4. D.$-9.60\times 10^{-17}J$
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   Answer: C

5. Q552009 · 27 Apr 2009 · Shift 1

   The surface of a metal is illuminated with the light of $400nm$. The kinetic energy of the ejected photoelectrons was found to be $1.68eV$. The work function of the metal is : ($hc=1240eV.nm$)

   1. A.$1.41eV$
   2. B.$1.51eV$
   3. C.$1.68eV$
   4. D.$3.09eV$
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   Answer: A

6. Q592009 · 27 Apr 2009 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: B