10th Standard CBSE - Maths - Statistics

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Question - 1

Light enters from air to glass plate having refractive index 1.5. The speed of light in glass is

  • A 5.5 x 1010 ms-1
  • B 2 x 108 ms-1
  • C 6.25 x 107 ms-1
  • D 4 x 108 ms-1

Question - 2

Raj is standing in front of a plane mirror. The distance between Raj and his image is 100cm. If the distance between the mirror and image is x. What could be the possible value of x?

  • A x = 25 cm
  • B x = 50 cm
  • C x = 200 cm
  • D x = 100 cm

Question - 3

A student obtained a sharp image of the grills of a window on a screen using a concave mirror. His teacher remarked that for getting better results a well lit distance object (preferably the sun) should be focussed on the screen. What should be done for this purpose?

  • A Move the screen slightly away from the mirror
  • B Move the screen and the mirror away form the object
  • C Move the mirror slightly towards the screen
  • D Move the screen and the mirror towards the object

Question - 4

Which one of the following materials cannot be used to make lens?

 

  • A Glass
  • B Clay
  • C Water
  • D Plastic

Question - 5

Light is refracted when it travels at an angle from water into air because

  • A Its speed is decreased
  • B Its speed remains the same
  • C It is moving from a less dense medium to a denser medium
  • D Its speed is increased

Question - 6

The mean of a data set with 12 observations is calculated as 19.25. If one more value is included in the data, then for the new data with 13 observations, mean becomes 20. The value of this 13th observation is

  • A 29
  • B 28
  • C 30
  • D 31

Question - 7

The mean of the following data is: 45, 35, 20, 15, 25, 40

  • A 15
  • B 25
  • C 35
  • D 30

Question - 8

If the median of the following data is 166.79, then the mean and mode are

Class Interval Frequency
130-140 5
140-150 9
150-160 17
160-170 28
170-180 24
180-190 10
190-200 7
  • A Mode = 161.9 Mean = 168
  • B Mode = 152.9 Mean = 166.73
  • C Mode = 160.9 Mean = 167
  • D Mode = 167.3, Mean = 168.03

Question - 9

Which measure of central tendency is obtained graphically by the point of intersection of less than and more than o gives

  • A Arithmetic mean
  • B Geometric mean
  • C Mode
  • D Median

Question - 10

A batsman in his 12th innings makes a score of 63 runs and thereby increases his average score by 2. His average score after 12th

  • A 41
  • B 60
  • C 51
  • D 45
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