Calorimetry — Physics STD 10 — Question

On what factors does the mechanical advantage of the first class lever depend on?

The voice of women is shrill as compared to men because of the difference in their:

The neutral and earth wires are connected at the local substation so that

An industrial electric equipment of power 10 kW is to be operated at mains of 280 volt. The current rating of the fuse to be connected with the motor should be?

A person standing in front of a vertical cliff whistles. He later moves towards the cliff by travelling a distance of 300 m at first, he hears the sound after 4 sec and then on travelling the distance he hears the echo after 9 sec . Time take for first echo is ___________ and time for the second echo is ________ .

Which of the following can be formed around an electric current passing through a conducting wire?

When current begins to run through such materials, it persists even if no potential difference exists. In this case, which of the following options is correct?

Two forces each of 5 N act vertically upwards and downwards respectively on the two ends of uniform metre rule which is placed at its mid point as shown in the diagram. The resultant moment of these forces about the mid-point is

The critical angle for glass-air interface is : ________ .