Physics
Grade-7
Easy

Question

Concave lenses are ____ in the middle and ____ towards the edge.

  1. Thicker, thinner
  2. Thinner, thicker
  3. Thicker, thicker
  4. Thinner, thinner

The correct answer is: Thinner, thicker

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Spherical lenses are _____ objects.

Spherical lenses are _____ objects.

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Convex lenses are ____ in the middle and ____ towards the edge

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Convex lenses are also called ___ lenses.

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David designs a game for the school fair. Participants roll two number cubes at the same time. If the sum of the numbers on the two cubes is 7, the player wins. About how many winners should Bob expect if 250 participants play this game?

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19 cards numbered 1, 2, 3………19 are put in a box and mixed thoroughly. One person draws a card from the box. Find the probability that the number on the card is odd.

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There are 40 students in a co-education school, out of which 30 are boys and the rest are girls. From these students, one student is chosen at random; what is the probability that the chosen student is a boy?

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The number of children in some families is recorded in the table shown below,

No. of children

0

1

2

3

4

No. of families

5

20

32

10

3

Find the probability that a randomly selected family has an odd number of children.

The number of children in some families is recorded in the table shown below,

No. of children

0

1

2

3

4

No. of families

5

20

32

10

3

Find the probability that a randomly selected family has an odd number of children.

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A dental survey of 500 students in a school revealed that 60 of them had two or more cavities. If the total school enrolment is 1500, how many students would you expect to have two or more cavities?

A dental survey of 500 students in a school revealed that 60 of them had two or more cavities. If the total school enrolment is 1500, how many students would you expect to have two or more cavities?

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Four people conducted an experiment to find how often a flipped coin lands on tails. The results are shown in the table below.

Name

 Total flips

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Brent

55

26

Bob

70

38

Amir

50

22

David

80

41

Total

255

127

Find the experimental probability of a flipped coin landing on tails.

Four people conducted an experiment to find how often a flipped coin lands on tails. The results are shown in the table below.

Name

 Total flips

 Tails

Brent

55

26

Bob

70

38

Amir

50

22

David

80

41

Total

255

127

Find the experimental probability of a flipped coin landing on tails.

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