List of practice Questions

A lens bounded by two spherical surfaces curved inwards is
If \(\frac{y}{4}\) and are the object and image distances due to a convex lens respectively, then its focal length is 
The symbol ↕ used to draw the ray diagrams indicates
The refractive index of glass with respect to air is 2. The critical angle at their interface is
If A and B are the speed of light in a medium and refractive index of that medium respectively, then
When we sit at a camp fire, objects beyond the fire are seen swaying. The principle involved in it is
A rectangular tank of depth 2 m is full of water of refractive index \(\frac{4}{3 }\) When viewed from the top, the bottom of the tank is seen at a depth of 
The physical quantity which has no units, is
If i and r are the angles of incidence and refraction respectively, then i <r means the light ray travels from
The device used to measure the specific heat of a substance is
The heat energy supplied to a system during melting is known as
Formation of dew on the surface of a cold soft drink bottle kept in air is due to
Pick the correct match :
AWaterI483
BGlassII4180
CIronIII504
Which among the following behaves like heat store house for the earth?
1 cal =
If the mode of the data 2, 4, 6, 7, 5, 6, 10, 6, 7, 2k + 1, 9, 7, 13 is 7, then the value of k is
Which of the following cannot be determined graphically?
If a data has 25 observations (arranged in ascending order), then which of the following observations represents the median?
If the mean of the following data is k(> 0), then the value of k is
MarksK4K83
FrequencyK2K3K4K5K
If a card is selected at random from a deck of 52 cards, then the probability of getting a red face card is
The mean of 12 numbers is 19. If 4 is subtracted from each number, then the new mean is
A box contains 3 blue, 2 white and 4 red balls. If a ball is drawn at random from the box, what is the probability that it will not be a white ball?
Two dice are thrown together. The probability of getting the same number on both dice is
Which of the following cannot be the probability of an event?
If sec θ+ tan θ= X, then tan θ =