O Mere Sona

A 210 meres long train crosses a platform of equal length in 20 seconds. What is the speed of the train ?

In a test, +3 marks are given for every correct answer and –1 mark are given for every incorrect answer. Sona attempted all the questions and scored +20 marks though she got 10 correct answers. How many questions were given in the test?

The sum of the ages of Mummy,Papa,Sonu, Sona and Sonia now is 96 years.Sonu is the youngest in the family.The year Sonu was born,the sum of the ages of all the members of the family was just 66 years.If Papa's age now is 6 xx that of Sonu's present age then Papa's age 10years hence will be:

In a test, +3 marks are given for every correct answer and –1 mark are given for every incorrect answer. Sona attempted all the questions and scored +20 marks though she got 10 correct answers. How many incorrect answers has she attempted?

Sona Ltd. purchased machinery costing Rs. 17,00,000 from Mona Ltd. Sona Ltd. paid 20% of the amount by cheque and for the balance amount issued equity shares of Rs. 100 each at a premium of 25%. Pass necessary Journal Entries for the above transactions in the books of Sona Ltd. Show your working notes clearly.

Sona was standing outside her house in the afternoon enjoying the light drizzle after the heavy rain. Suddenly she saw a rainbow in the sky. Sona called out her father and asked him what a rainbow is and how it is formed. Sona's father told her that rainbow is an arch of seven colours visible in the sky which is produced by the splitting of white sunlight by tiny raindrops in the atmosphere. He also told Sona that a similar phenomenon can also be observed in a science laboratory by passing white light through a transparent object. (a) What is the name of the phenomenon which produces rainbow ? (b) Name the seven colours of the rainbow. Which of them deviates the most ? (c) When the rainbow is formed, state whether the sun is shining in the sky or not. (d) Name the transparent object which can be used to observe the phenomenon similar to a rainbow in the science laboratory. (e) What values are displayed by Sona's father ?