Physics
Grade-7
Easy
Question
Except for normal incidence, the incident ray is ____ parallel to the corresponding emergent ray in case of refraction through a spherical lens.
- Always
- Never
- Sometimes
- Often
The correct answer is: Always
Related Questions to study
Physics
During the normal incidence of a light ray on a spherical lens, the light ray ____.
During the normal incidence of a light ray on a spherical lens, the light ray ____.
PhysicsGrade-7
Physics
A light ray bends ____ on entering the air from ____.
A light ray bends ____ on entering the air from ____.
PhysicsGrade-7
Physics
When a parallel beam of light falls on a surface of a convex lens, it ____ the rays of light in it to a point called ____.
When a parallel beam of light falls on a surface of a convex lens, it ____ the rays of light in it to a point called ____.
PhysicsGrade-7
Physics
Concave lenses are ____ in the middle and ____ towards the edge.
Concave lenses are ____ in the middle and ____ towards the edge.
PhysicsGrade-7
Physics
Spherical lenses are _____ objects.
Spherical lenses are _____ objects.
PhysicsGrade-7
Physics
Convex lenses are ____ in the middle and ____ towards the edge
Convex lenses are ____ in the middle and ____ towards the edge
PhysicsGrade-7
Physics
Convex lenses are also called ___ lenses.
Convex lenses are also called ___ lenses.
PhysicsGrade-7
Physics
____ are widely used in spectacles, microscopes, and telescopes
____ are widely used in spectacles, microscopes, and telescopes
PhysicsGrade-7
Mathematics
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?
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?
MathematicsGrade-7
Mathematics
When a card is drawn from a well-shuffled pack of 52 cards, what is the probability that it will be an ace?
When a card is drawn from a well-shuffled pack of 52 cards, what is the probability that it will be an ace?
MathematicsGrade-7
Mathematics
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.
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.
MathematicsGrade-7
Mathematics
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?
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?
MathematicsGrade-7
Mathematics
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 |
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 |
MathematicsGrade-7
Mathematics
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?
MathematicsGrade-7
Mathematics
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 |
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 |
MathematicsGrade-7
