i only
i and ii only
ii and iii only
i, ii, iii and iv only
all five
Correct answer is E
No explanation has been provided for this answer.
1
2
3
4
5
Correct answer is C
No. of image formed = \(\frac{360}{\theta}\) - 1
= \(\frac{360}{90}\) - 1
= 3 images
The visible part of light consists of the following colours
red, indigo, infra-red, violet, yellow, green and blue
red, green, blue, violet, indigo, orange and yellow
blue, ultra-violet, infra-red, red, yellow, indigo, violet,green and orange
infra-red and ultra-violet
red, orange, yellow, green, blue, indigo and infra-red
Correct answer is B
The visible colors of white light is given by the acronym: ROYGBIV which stands for Red, Orange, Yellow, Green, Blue, Indigo and Violet.
0.5cm
1.5cm
3cm
2.5cm
2cm
Correct answer is E
\(\frac{\text{image distance}}{\text{object distance}}\) = \(\frac{\text{image height}}{\text{object height}}\)
\(\frac{30}{15}\) = \(\frac{\text{image height}}{1}\)
image height = 2cm
170ms-1
136ms-1
340ms-1
680ms-1
510ms-1
Correct answer is C
Velocity = \(\frac{\text{distance}}{\text{time}}\)
echo time = halt total time
= \(\frac{1}{2}\) x 4 = 25
velocity = \(\frac{680}{2}\)
= 340ms-1