Class 12th

In the above diagram, a strong bar magnet is moving towards solenoid-2 from solenoid-1. The direction of induced current in solenoid-1 and that in solenoid-2, respectively, are through the directions:

A train can cross a pole in 8 seconds. If the speed of train is 108 km/hr, then what will be the length of this train?

A and B are 120 km start from each other. A and B start moving at the same time with the speed of 36 km/hr and 24 km/hr in the same distance. If A is following B, then in how much time A will catch B?

If 20 Pumps can raise 1500 tons of water in 18 days working 10 hour per day, then 45 pumps will raise how many tons of water in 16 days working 4 hours per day?

Raj and Mohan together can complete work in 20 days. Mohan and Sohan together can complete the same work in 12 days. Raj and Sohan together can complete the same work in 15 days. In how many days Raj alone can complete the work?

Mahesh and Anand together can polish the floors of a building in 60 days. Mahesh alone can complete (1\4) part of the total work in 45 days. In how many days Anand alone can polish the floor of the same building?

The terminal voltage of the battery, whose emf is 10 V and internal resistance $1\Omega$ , when connected through an external resistance of $4\Omega$  as shown in the figure is:

In a group of 80 persons, there are food provision for 150 days. If 70 more persons join the group, then how long will these provision last?

A, B, and C alone can complete a work in 150, 100 and 60 days respectively. In how many days A, B and C together can complete the same work?

The graph which shows the variation of $\left(\frac{1}{{\lambda }^2}\right)$ and its kinetic energy, $E$ is (where $\lambda$ is de Broglie wavelength of a free particle):