JEE, NEET, Foundation & CBSE (JEE Advanced 2018

In a coil of resistance 100 Ω, a current is induced by changing the magnetic flux through it as shown in the figure. The magnitude of change in flux through the coil is :
  1. 200 Wb
  2. 225 Wb
  3. 250 Wb
  4. 275 Wb
An accident in nuclear laboratory resulted in deposition of a certain amount of radioactive material of half -life 18 days inside the laboratory. Tests revealed that the radiation was 64 times more than the permissible level require for safe operatio
  1. 64
  2. 90
  3. 108
  4. 120
The moment of inertia of a uniform cylinder of length l and radius R about its perpendicular bisector is I. What is the ratio l/R such that the moment of inertia is minimum ?
The temperature of an open room of volume 30 m³increases from 17°C to 27°C due to the sunshine. The atmospheric pressure in the room remains 1×10⁵ Pa. In nᵢ & nf are the number of molecules in the room before & after heating, the nf – nᵢ
  1. – 1.61 × 10₂₃
  2. 1.38 × 10₂₃
  3. 2.5 × 10₂₅
  4. -2.5 × 10₂₅
A copper ball of mass 100 gm is at a temperature T. It is dropped in a copper calorimeter of mass 100 gm, filled with 170 gm of water at room temperature. Subsequently, the temperature of the system is found to be 75°C. T is given by : (Given : room
  1. 800⁰C
  2. 825⁰C
  3. 885⁰C
  4. 1250⁰C
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