Question
Ice at 0°C is used to cool water from 70°C to 20°C
30 g of ice at 0°C is used to bring down the temperature of a certain mass of water at 70°C to…
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Class: Class 10
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Question
Three identical bulbs are connected to a 12 V battery
Three identical bulbs B1, B2 and B3, each of power rating 18 W, 12 V, are connected to a battery of 12…
Question
Study the nuclear reaction and answer the questions that follow
Study the reaction given below and answer the questions that follow: (a) Name the process depicted in the reaction. (b) What is…
Question
The diagram shows wiring in a meter room of a building
The diagram shows wiring in a meter room of a building. (a) What is the current rating of device X? (b) What…
Question
Two sound boxes have wires of the same length and tension
The diagrams given below show two sound boxes A and B with wires of the same length (l) and tension (10 kgf)…
Question
A submarine sends an ultrasonic ping and receives the reflected wave
A submarine in the sea, sends an ultrasonic ping and a stopwatch is started simultaneously. The stopwatch stops on receiving the reflected…
Question
Draw a block and tackle system of pulleys with velocity ratio equal to 3
Draw a block and tackle system of pulleys with velocity ratio equal to 3.
Question
Richa leaves point P on her skateboard and reaches point Q
Richa weighing 40 kgf leaves point P on her skateboard and reaches point Q on the ground with velocity 10 m s⁻¹.…
Question
Three levers X, Y and Z of equal lengths are shown in the diagram
Three levers X, Y and Z of equal lengths are shown in the diagram. (a) Which class of lever do these belong…
Question
Akash takes a uniform metre scale and suspends weights at its ends
Akash takes a uniform metre scale and suspends a weight of 2 N at one end ‘X’, and a weight of 5…