Please select a subject first
Advertisements
Advertisements
State the condition when it is advantageous to connect cells in parallel.
Concept: undefined >> undefined
How should the electric lamps in a building be connected?
Concept: undefined >> undefined
Advertisements
What determines the direction of flow of electrons between two charged conductors kept in contact?
Concept: undefined >> undefined
Which part of an electrical appliance is earthed?
Concept: undefined >> undefined
State the conditions for the flow of charge in a circuit from one point to the other.
Concept: undefined >> undefined
An electrical gadget can give an electric shock to its user under certain circumstances. Mention any two of these circumstances.
Concept: undefined >> undefined
An electrical appliance is rated at 1000 KVA, 220V. If the appliance is operated for 2 hours, calculate the energy consumed by the appliance in: (i) kWh (ii) joule.
Concept: undefined >> undefined
Three resistances, of which two are equal when connected in series have an effective resistance of 30 ohms. When the three resistances are connected in parallel, the effective resistances is 3 ohms. Find the values of the individual resistances.
Concept: undefined >> undefined
An electric bulb is marked 100 W, 250 V. How much current will the bulb draw if connected to a 250 V supply?
Concept: undefined >> undefined
State whether a magnetic field is associated or not around a current carrying conductor.
Concept: undefined >> undefined
Which colour of white light is deviated most.
Concept: undefined >> undefined
Which colour of white light is deviated at least?
Concept: undefined >> undefined
Write approximate wavelength for (i) blue (ii) red light. Which colour has the higher speed in a vacuum? Which colour has the higher speed in the glass?
Concept: undefined >> undefined
State and explain ‘Ampere’s Swimming Rule’ to determine the direction of magnetic field (or magnetic lines of force) around a current carrying conductor.
Concept: undefined >> undefined
An imaginary material reflects red light, scatters green light, transmits blue light, and absorbs yellow, orange, and violet light. A cube of this material is shown in the given diagram.
The surface is illuminated with a beam of white light. What colour will this cube appear?
(i) from above,
(ii) from below and
(iii) from the sides?
Concept: undefined >> undefined
Describe an experiment to show that there is a magnetic field around a current carrying conductor.
Concept: undefined >> undefined
A block of glass is pushed into the path of the light as shown below. Then the converging point x will:
Concept: undefined >> undefined
What does the direction of current convey?
Concept: undefined >> undefined
At what frequency is the a.c. supplied to our houses?
Concept: undefined >> undefined
By using a compass needle describe how can you demonstrate that there is a magnetic field around a current carrying conductor.
Concept: undefined >> undefined
