Physics
Grade-7
Easy
Question
Which of the given lenses can be used to light a fire?
- Concave
- Convex
- Combination of two concave
- Combination of two convex
The correct answer is: Convex
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Which lens is used in a magnifying glass?
Which lens is used in a magnifying glass?
PhysicsGrade-7
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When an object is moved too close to a convex lens, it forms a _____ image of that object.
When an object is moved too close to a convex lens, it forms a _____ image of that object.
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Except for normal incidence, the incident ray is ____ parallel to the corresponding emergent ray in case of refraction through a spherical lens.
Except for normal incidence, the incident ray is ____ parallel to the corresponding emergent ray in case of refraction through a spherical lens.
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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 ____.
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A light ray bends ____ on entering the air from ____.
A light ray bends ____ on entering the air from ____.
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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
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Concave lenses are ____ in the middle and ____ towards the edge.
Concave lenses are ____ in the middle and ____ towards the edge.
PhysicsGrade-7
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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
Convex lenses are ____ in the middle and ____ towards the edge
PhysicsGrade-7
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Convex lenses are also called ___ lenses.
Convex lenses are also called ___ lenses.
PhysicsGrade-7
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____ 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
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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
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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?
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
