Class 10 Physics1)
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
Class 10 Physics2)
To get 2 Ω resistance using only 6 Ω resistors, the number of them required is
Three resistors of 2 Ω is required to get 6 Ω because resultant is more than individual so they all must be connected in series.
Class 10 Physics3)
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
In parallel combination, voltage remains same across two points.
Class 10 Physics4)
Two resistors are connected in series gives an equivalent resistance of 10 Ω. When connected in parallel, gives 2.4 Ω. Then the individual resistance are
6 Ω and 4 Ω
In series, Rs = R1 + R2 = 10 Ω
Class 10 Physics5)
he resistance of hot filament of the bulb is about 10 times the cold resistance. What will be the resistance of 100 W-220 V lamp, when not in use?
Class 10 Physics6)
A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of
In order to get the working of heater properly, fused wire of higher rating must be used.
Class 10 Physics7)
A cooler of 1500 W, 200 volt and a fan of 500 W, 200 volt are to be used from a household supply. The rating of fuse to be used is
Total power used, P = P1 + P1 = 1500 + 500 = 2000 W.
Current drawn from the supply,
Class 10 Physics8)
If the current I through a resistor is increased by 100 % (assume that temperature remains unchanged), the increase in power dissipated will be
Class 10 Physics9)
The resistivity does not change if
the shape of the resistor is changed
The resistivity does not change if the shape of resistor is changed because nature of material will remain same.
Class 10 Physics10)
Electric potential is a:
X can complete half of the work in 20 days and Y can do one-fifth of the same work in 10 days. X started the work and left after 8 days. Then Y took over to complete the remaining work. The total number of days taken by them to complete the work is:Watch Solution
A can do a work in 5 days while B can do the same work in 8 days. They worked together to complete the work and earned Rs. 6760. Find A’s share?Watch Solution
18 men can complete a certain work in 15 days working 8 hours a day. How many men can complete the same work in 12 days working 9 hours a day?Watch Solution
5 men, 6 women and 4 children can complete a work in 10 days. 6 women and 6 children can do it in 20 days, while 2 men and 6 women can do it in 18 days. In how many days will 2 men and 1 woman will complete the same work?Watch Solution
40 persons take 6 days to complete a certain task, working 10 hours a day. How many hours a day will be sufficient for 30 persons to complete the same task in 10 days?Watch Solution