Question
Which lens is used in sodium reflector lamp
?ÂSolution
Convex mirrors are used as reflectors in sodium reflector lamps because they are able to spread the light over a wide area. The neon gas lights at a lower temperature. As the temperature increases the sodium begins to vaporize and the lamp turns to a pure yellow. Argon has a lower glow voltage, argon helps the smaller lamps start at a lower voltage. The larger LPS lamps used in street lighting for the most part do not use argon.Â
A spent 12.5% of his monthly income on study and 32% of the remaining on rent. If amount spent on rent is Rs. 1512, then find the amount spent on study
In a train, 45% of the passengers are females. Out of total number of passengers, 65% have unreserved tickets out of which 27% are females. How much per...
Amit scored 10% marks in a test and failed by 70 marks, while Lisa scored 30% marks in the same test and failed by 30 marks. Find the passing marks of t...
A quantity is increased by 60% at first, and later decreased by 45%. Calculate the net percentage change.
Kumar spent 20% of his monthly salary on rent, 40% of his remaining salary on food and clothes, and saved the rest. If he saved Rs. 9,600 and the amount...
A student multiplied a number by 8/5 instead of 5/8. What is the percentage error in the calculation?
- In a certain examination, Neha got 46% and was 10 marks short of passing. Kunal got 52% and scored 8 marks more than required. What are the passing marks?
A Company allow 8% commission on the total sales to its salesman but if the salesman is appointed on a fix salary of Rs. 10000 and 6% commission on the...
- Due to a 20% hike in the price of cooking oil, how much should consumption be decreased to keep the total cost the same?Round your answer to the nearest in...
The sum of the monthly incomes of âAâ, âBâ and âCâ is Rs. 90000 which is 4 times the monthly income of âCâ. If âAâ spends 55% of his...