Other Physics · JEE Main previous year questions

2017 6 questions

1. Q322017 · 9 Apr 2017 · Shift 1

   A car is standing 200 m behind a bus, which is also at rest. The two start moving at the same instant but with different forward accelerations. The bus has acceleration $2m/{\mathrm{s}}^2$ and the car has acceleration $4m/{\mathrm{s}}^2$ . The car will catch up with the bus after a time of :

   1. A.$\sqrt{110}s$
   2. B.$\sqrt{120}s$
   3. C.$10\sqrt{2}s$
   4. D.$15\mathrm{s}$
   Show answer

   Answer: C

2. Q452017 · 9 Apr 2017 · Shift 1

   Imagine that a reactor converts all given mass into energy and that it operates at a power level of $10^9\mathrm{watt}$. The mass of the fuel consumed per hour in the reactor will be : (velocity of light, c is $3\times 10^{8}m/s$)

   1. A.$0.96\mathrm{gm}$
   2. B.$0.8\mathrm{gm}$
   3. C.$4\times 10^{-2}\mathrm{gm}$
   4. D.$6.6\times 10^{-5}\mathrm{gm}$
   Show answer

   Answer: C

3. Q512017 · 9 Apr 2017 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
   Show answer

   Answer: B

4. Q322017 · 8 Apr 2017 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
   Show answer

   Answer: C

5. Q452017 · 8 Apr 2017 · Shift 1

   In a physical balance working on the principle of moments, when 5 mg weight is placed on the left pan, the beam becomes horizontal. Both the empty pans of the balance are of equal mass. Which of the following statements is correct ?

   1. A.Left arm is longer than the right arm
   2. B.Both the arms are of same length
   3. C.Left arm is shorter than the right arm
   4. D.Every object that is weighed using this balance appears lighter than its actual weight.
   Show answer

   Answer: C

6. Q522017 · 8 Apr 2017 · Shift 1

   The maximum velocity of the photoelectrons emitted from the surface is v when light of frequency n falls on a metal surface. If the incident frequency is increased to 3n, the maximum velocity of the ejected photoelectrons will be :

   1. A.less than $\sqrt{3}\mathrm{v}$
   2. B.$\mathrm{v}$
   3. C.more than $\sqrt{3}v$
   4. D.equal to $\sqrt{3}v$
   Show answer

   Answer: C