Science
(i) Define Electric Power and write its SI unit.
(ii) Two bulbs rated 100 W; 220 V and 60 W; 220 V are connected in parallel to an electric mains of 220 V. Find the current drawn by the bulbs from the mains.
Related Questions
(a) Mention one function each of the following organs in human male reproductive system :
- Testis
- Scrotum
- Vas deferens
- Prostate gland
(b) Name the type of germ cell which
- is motile
- stores food.
(a) Three resistors R1, R2 and R3 are connected in parallel and the combination is connected to a battery, an ammeter, a voltmeter and a key. Draw suitable circuit diagram to show the arrangement of these circuit components along with the direction of current flowing.
(b) Calculate the equivalent resistance of the following network :
(i) State Joule's law of heating. Express it mathematically when an appliance of resistance R is connected to a source of voltage V and the current I flows through the appliance for a time t.
(ii) A 5 Ω resistor is connected across a battery of 6 volts. Calculate the energy that dissipates as heat in 10 s.
(a) Name the group of organisms which form in the first trophic level of all food chains. Why are they called so ?
(b) Why are the human beings most adversely affected by bio-magnification ?
(c) State one ill-effect of the absence of decomposers from a natural ecosystem.