a) What are alloys?
b)How are they made?
c) Give the constituents and uses of Solder, Brass and Bronze Question 2: An electric iron has a rating of 750W, 220V. Calculate
(i) current passing through it, and
(ii) its resistance, when in use Question 3:
1) Which hormone is injected to a diabetic patient and why?
2) What will happen in intake of iodine in our diet is low?
Define electromagnetic induction. What are the different ways to induce current in a coil? Question 5: True and False statement
a) The spacing between the magnetic lines of forces increases as we move away from current carrying conductor?
b) The graph between V and I for metals is a curve.
c) Electric motor converts electrical energy into mechanical energy
d) Insulators have high resistivity and negligible conductivities.
f) Current does not gets divided in series combination.
g) Voltage get divided in parallel combination
h) Current increases substantially at the time of short circuit
i) 1 Watt = 1 Volt / 1 Ampere
j) MRI stands for magnetic resonance imaging
1)What are amphoteric oxides?
2) Give two examples of amphoteric oxides with balanced chemical equation? Question 7:
Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why? Question 8:
State two criteria each in the selection of each of the following:
(i) Good fuel
(ii) Good source of energy Question 9:
Write the electron dot structure for following
Derive an expression for equivalent resistance for the three resistors R1 , R2 and R3 connected in