For the following questions answer them individually
How many times are the hands of a clock is at right angle in a day?
In how many different ways can the letters of the word OPTICAL be arranged, so that the vowels always come together?
A can contains a mixture of two liquids A&B in the ratio 7:5. When 9 litres of the mixture are drawn off and the can is filled with B, the ratio of A&B becomes 7:9. How many litres of liquid A was contained by the can Initially?
When the art work is experienced through reflected light, we are looking at
The colour wheel, conceived by bending the colours of the spectrum and adding purple, was first conceived by
The illumination level in houses is in the range of
Which of the following lamp gives nearly monochromatic light?
Which of the following is not a characteristic of a musical sound?
A human body feels comfortable when the heat produced by the metabolism of human body is equal to the
The difference of temperature between the outside air and inside air tends to the deposition of moisture in the room surfaces known as