Physics_Grade 10

Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points is

• current

• voltage

• resistance

• None of these

Calculate the current flows through the 10 Ω resistor in the following circuit.

• 1.2 A

• 0.6 A

• 0.2 A

• 2.0 A

A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of

• more length

• less radius

• less length

• more radius

f R₁ and R₂ be the resistance of the filament of 40 W and 60 W respectively operating 220 V, then

• R₁ < R₂

• R₂ < R₁

• R₁ = R₂

• R₁ ≥ R₂

A boy records that 4000 joule of work is required to transfer 10 coulomb of charge between two points of a resistor of 50 Ω. The current passing through it is

• 2 A

• 4 A

• 8 A

• 16 A

The temperature of a conductor is increased. The graph best showing the variation of its resistance is

• 
• 
• 

A coil in the heater consume power P on passing current. If it is cut into halves and joined in parallel, it will consume power

• P

• P/2

• 2P

• 4P

If an electric charge of 300C flows for 10 minutes then what is the value electric current flowing

• 5A

• 00.05A

• 0.5A

• 5.5A

In an electric circuit, the instrument used to change the resistance in the circuit is called as

• Variable resistance

• Rheostat

• Resistance box

• Voltmeter

The materials having resistivity in the range of 10-8 ohm m to 10-6 ohm m are

• Metals

• Alloys

• Insulators

• Both a and b