First Term Examination – 2014
Physics – Standard 10 – Answer key
- Ohm metre (ohm m)
- b. High melting point
- b. There are three identical armature coils arranged at an angle of 120 degree with one another, against each pair of magnetic poles
- A Ba. Heating Effect - Heaterb. DC Generator - Split ringc. Electric Power - Wattd. AC Generator - Slip ring
- a. yesb. The fuse wire melts and circuit break . When the switch is made ON it become short circuit.
- a. It is heavy and to avoid problems due to electric spark.b. To give DC to the electromagnets of Field Magnet.
- a. frequencyb. electronic circuitc. Low Power, Easy to handle, Cheap, Gives maximum Light energy
- a. Intensity of light decreasesb. It decreases againc. Self Induction
- a. Chromiumb. Increase the currentc. No. The Chromium atoms from +ve electrode enter to the electrolyte and its mass decreases
- a. circuit 1b. circuit 1c. In circuit 1 the current is more. In circuit 2 the resistance is more. The circuit which more current will give more heat as the heat is proportional to the square of the Current(H= I2Rt)
- a. It will be varying magnetic fluxb. Yesc. Step up Transformer
- a. DC generatorb.
- a. A= Permanent magnet, B= Voice coilb. Electrical Energy → Sound Energyc. Motor Principle ( Current carrying conductor in a magnetic field experience a force)
- Aa. power P = V2/R = 200 x 200 /100 =400 Wb Heat H = P x t = 400 x 5 x 60 = 120000 JBa. Vp Ip = Vs Is20 x 3 = 60 x IsIs = 60 /60 = 1 Ab. Step Up Transformerc Vs/Vp = Ns/Np60 /20 = Ns / 250Ns = 60 x 250 / 20 = 750 Nos(നിര്ദ്ദേശങ്ങള് ക്ഷണിക്കുന്നു. തിരക്കുപിടിച്ച് ചെയ്തതുകൊണ്ട് തെറ്റുകള് ഉണ്ടായേക്കാം....)