A boy weighing 40kgf climbs up a stair of 30 steps each 20cm high in 4 minute and a girl weighing 30kgf does the same in 3 minutes. Compare:-

1. The work done by them.
2. The power developed by them.

A block and tackle system of pulleys has velocity ratio 4.

1. Draw a neat, labelled diagram of the system indicating clearly the points of application and direction of load and effort.
2. What will be its
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State one other qualification required to become a Judge of the High Court, apart from Indian citizenship.

Lacrimal gland

Mention the exact location of the following:

1. What do you understand by the term nuclear fusion?
2. Nuclear power plants use nuclear fission reaction to produce electricity. What is the advantage of producing electricity by fusion reaction?

1. What are isobars?
2. Give one example of isobars.

Name the colour code of the wire which is connected to the metallic body of an appliance.

Give a reason: Thar is a desert

Aluminum carbide reacts with water according to the following equation:

Al₄C₃ + 12H₂O → 4Al (OH)₃ + 3CH₄

1. What mass of aluminum hydroxide is formed from 12 g of aluminum carbide?
2. What volume
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The diagram above shows three resistors connected across a cell of e.m.f. 1.8 V and internal resistance r. Calculate:

1. Current through 3 W resistor.
2. The internal resistance r.

The kind of lens required to correct Myopia.

Which coil of a step up transformer is made thicker and why?

You have three resistors of values 2Ω, 3Ω and 5Ω. How will you join them so that the total resistance is more than 7Ω?

1. Draw a diagram for the arrangement.
2. Calculate the equivalent resistance.

Name a state that is the first to experience the onset of the monsoon.

Name the state that produces the largest amount of limestone

(i) Define moment of force.

 (ii) Write the relationship between the SI and CGS unit of moment of force.