प्रकाश परावर्तन तथा अपवर्तन - L19 |Class 10 विज्ञान | Ruchi Ma'm| 6 PM | Doubtnut

A 2 kW heater, a 200 WTV and three 100W lamps are all switched on from 6 p.m. to 10 p.m. What is the total cost at Rs. 5.50 per kWh?

Winners Announcement 10 Sep 2020 | Day -19 | Doubtnut Live Class Daily Quiz Contest | Leaderboard

An electron in potentiometer experiences a force 2.4xx10^(-19)N . The length of potentiometer wire is 6m. The emf of the battery connected across the wire is (electronic charge =1.6xx10^(-19)C )

A photoelectron is moving with a maximum velocity of 10^(6) m//s . Given e=1.6xx10^(-19) c , and m=9.1xx10^(-31) kg , the stopping potential is

If L = 39.5 , Delta_(1) = 6 , Delta_(2) = 9 and c = 10 , then find the mode of the data .

. Reena leaves office at 6.00 p.m. and catches a 6.30 p.m. local train that arrives in her town at 7.00 p.m. Her father leaves home to pick her up at 7.00 p.m. from the station as she gets off the train. Yesterday, Reena left her office early and took a 6.00 p.m. train and arrived at 6.30 p.m. As her father was not there to pick her up, she started walking towards home. Her father left home at the usual time, saw her daughter walking, turned around, picked her up and drove home, arriving there 10 minutes earlier than the usual. For how long did Reena walk before her father picked her up? 10 m in b. 1 m in c. 25 m in d. 20 m in

How many electrons pass through a lamp in 2 minutes, if the current is 300 mA. Given that charge on an electron is 1.6 xx 10^(-19)C .

A body travels uniformly a distance of (10.2pm0.4) m in a time interval (6.0pm0.2)s . The speed of the particle is best expressed as (in m//s^(-1) ).