Sarika took distilled water in a bottle and tried to find whether it conducts electricity or not. What is she likely to find?

• It is good conductor of electricity
  
  

• It is an insulator
  
  

• It is poor conductor of electricity
  
  

• None of the above

Which one of the following statements is not correct?

• There is a maximum limit of current which can safely flow in the electric circuit.
  
  

• Fuses are inserted in electric circuits of all the buildings
  
  

• If the proper fuse is inserted in a circuit, it will blow off, if the current is more than the safe limit.
  
  

• There is a minimum limit of current which can safely flow in the electric circuit.

Which one of the following materials is ferromagnetic?

• Nickel
  
  

• Wood
  
  

• Gold
  
  

• Manganese

When a glass rod is rubbed with silk, then which type of charge is created on it?

• Positive charge
  
  

• Negative charge
  
  

• Electric charge
  
  

• None of these

Mica is used in cooking utensils because it is

• good conductor of heat but bad conductor of electricity
  
  

• bad conductor of heat but good conductor of electricity
  
  

• good conductor of both heat and electricity
  
  

• bad conductor of both heat and electricity

The angle of dip at magnetic pole of earth is

• 0°
  
  

• 45°
  
  

• 90°
  
  

• 135°

7.

In household wiring, what is the colour of 'earth wire'?

• Red
  
  

• Green
  
  

• Black
  
  

• White

Kirchhoff's current law is based on the conservation of

• energy
  
  

• momentum
  
  

• charge

• mass

Who discovered X-rays?

• Roentgen
  
  

• Maxwell
  
  

• Rutherford 
  
  

• Torricelli

A battery of 15 V is connected to a parallel group of resistance of 4, 10 and 20 $\mathrm{\Omega }$. The current in the circuit will be

• 6 A
  
  

• 4 A
  
  

• 8 A
  
  

• 2 A