Learn Science Heat , Class 7 Science Heat Exercise, Free Online Heat Lessons

Class 7 Science Study Material

An Educational platform for Preparation and Practice Class 7. Kidsfront provide unique pattern of learning Science with free online comprehensive study material in the form of QUESTION & ANSWER for each Chapter of Science for Class 7. This study material help Class 7, Science students in learning every aspect of Heat . Students can understand Heat concept easily and consolidate their learning by doing Online Practice Tests on Science ,Heat chapter repeatedly till they excel in Class 7, Heat . Free ONLINE PRACTICE TESTS on Class 7, Heat comprise of Hundreds of Questions on Heat , prepared by the highly professionals team. Every repeat test of Heat will have new set of questions and help students to prepare themselves for exams by doing unlimited Online Test exercise on Heat . Attempt ONLINE TEST on Class 7,Science ,Heat in Academics section after completing this Heat Question Answer Exercise.

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Heat

Concave mirror

a) Has a reflecting surface that bulges inward.
b) Has a reflecting surface that bulges outward.
c) Is also called as a diverging mirror.
d) Is also called a plane mirror.

✔Answer

✔Solution

Correct Answer Is : Has a reflecting surface that bulges inward.

Solution Is : A concave mirror or converging mirror has a reflecting surface that bulges inward and the outer surface is painted.

A kaleidoscope is

a) An optical toy.
b) A magnetic toy.
c) An electrical toy.
d) An electromagnetic toy.

✔Answer

✔Solution

Correct Answer Is : An optical toy.

Solution Is : Kaleidoscope is an optical toy which uses plane mirrors and is based on the principle of multiple reflections of light. It makes use of three plane mirrors arranged at 60 degree angle to each other in a tube. This instrument is use to make new designs.

An image obtained by a plane mirror, the left side of an object appears to be

a) The
b) The
c) The
d) The

✔Answer

✔Solution

Correct Answer Is : The

Solution Is : An image obtained by a plane mirror is laterally inverted, i.e., the left side of an object appears to be?the right side of an image and the right side of an object appears to be the left side of an image.

In the side mirror of a car, the size of the images of all the objects appear to be

a) Same as that of the size of the objects.
b) Smaller than the objects.
c) Larger than the objects.
d) Of point size.

✔Answer

✔Solution

Correct Answer Is : Smaller than the objects.

Solution Is : The side mirror of a car is a convex mirror. The image formed by a convex mirror is virtual, erect and smaller than the size of the object.

Generally, the colour of the sunlight is

a) Blue in colour.
b) Yellow in colour.
c) White in colour.
d) Orange in colour.

✔Answer

✔Solution

Correct Answer Is : White in colour.

Solution Is : When sunlight is made to pass through a glass prism, we get seven rainbow colours. By rotating the seven rainbow coloured Newton`s disc, we get white colour. Thus, sunlight is white in colour.

Concave mirror is a

a) Spherical mirror.
b) Plane mirror.
c) Cylindrical mirror.
d) Curvilinear mirror.

✔Answer

✔Solution

Correct Answer Is : Spherical mirror.

Solution Is : The concave mirror is a spherical mirror. It is so called because it is a part of a sphere whose outer surface is silver coated and the reflections takes place from the inner surface.

When a small circular disc painted with seven colours of the rainbow is rotated, we see

a) The seven colours appearing blured.
b) The seven colours appearing bright.
c) Only black colour.
d) Only white colour.

✔Answer

✔Solution

Correct Answer Is : Only white colour.

Solution Is : Sir Isaac Newton demonstrated that white light is a combination of the seven different colours found in a rainbow (splitting of white sunlight when pass through the prism into seven colours). If a small circular disc with seven rainbow colours painted on it, is rotated fast, all the colours get mixed up and the disc`s colour appears to be white.

Objects become visible to us because

a) Light is absorbed by them.
b) Light is reflected by them before reaching our eyes.
c) They
d) Light passes through them.

✔Answer

✔Solution

Correct Answer Is : Light is reflected by them before reaching our eyes.

Solution Is : We can see the objects only when light falls on them and gets reflected towards our eye.

Height of candle is 10 cm. Height of its image seen in the plane mirror is

a) 20 cm.
b) 5 cm.
c) 10 cm.
d) 1 m.

✔Answer

✔Solution

Correct Answer Is : 10 cm.

Solution Is : An image formed by a plane mirror is erect and of the same size as that of an object. In this case, the height of an image formed is same as that of an object which is 10 cm.

You cannot see the flame of a lighted candle through a bent pipe but you can see it through a straight pipe, because

a) Light travels in a straight line.
b) Pipe is polished.
c) Bent pipe was blocked.
d) The straight pipe is

✔Answer

✔Solution

Correct Answer Is : Light travels in a straight line.

Solution Is : You cannot see the flame of a lighted candle through a bent pipe but you can see it through a straight pipe, because light always travel in a straight line.

❑Acids, Bases and Salts
❑Nutrition in Animals
❑Motion and Time
❑Light
❑Heat
❑Forests- Our Lifeline
❑Fibre to Fabric
❑Weather Climate and Adaptations of Animals to Climate
❑Water A Precious Resource
❑Waste Water Story
❑Transportation in Animals and Plants
❑Soil
❑Reproduction in Plants
❑Electric Current And Its Effects
❑Respiration in Organisms
❑Nutrients in Plants
❑Physical and Chemical Changes

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Class 7 Science Study Material

Heat

Concave mirror

Correct Answer Is : Has a reflecting surface that bulges inward.

Solution Is : A concave mirror or converging mirror has a reflecting surface that bulges inward and the outer surface is painted.

A kaleidoscope is

Correct Answer Is : An optical toy.

Solution Is : Kaleidoscope is an optical toy which uses plane mirrors and is based on the principle of multiple reflections of light. It makes use of three plane mirrors arranged at 60 degree angle to each other in a tube. This instrument is use to make new designs.

An image obtained by a plane mirror, the left side of an object appears to be

Correct Answer Is : The

Solution Is : An image obtained by a plane mirror is laterally inverted, i.e., the left side of an object appears to be?the right side of an image and the right side of an object appears to be the left side of an image.

In the side mirror of a car, the size of the images of all the objects appear to be

Correct Answer Is : Smaller than the objects.

Solution Is : The side mirror of a car is a convex mirror. The image formed by a convex mirror is virtual, erect and smaller than the size of the object.

Generally, the colour of the sunlight is

Correct Answer Is : White in colour.

Solution Is : When sunlight is made to pass through a glass prism, we get seven rainbow colours. By rotating the seven rainbow coloured Newton`s disc, we get white colour. Thus, sunlight is white in colour.

Concave mirror is a

Correct Answer Is : Spherical mirror.

Solution Is : The concave mirror is a spherical mirror. It is so called because it is a part of a sphere whose outer surface is silver coated and the reflections takes place from the inner surface.

When a small circular disc painted with seven colours of the rainbow is rotated, we see

Correct Answer Is : Only white colour.

Objects become visible to us because

Correct Answer Is : Light is reflected by them before reaching our eyes.

Solution Is : We can see the objects only when light falls on them and gets reflected towards our eye.

Height of candle is 10 cm. Height of its image seen in the plane mirror is

Correct Answer Is : 10 cm.

Solution Is : An image formed by a plane mirror is erect and of the same size as that of an object. In this case, the height of an image formed is same as that of an object which is 10 cm.

You cannot see the flame of a lighted candle through a bent pipe but you can see it through a straight pipe, because

Correct Answer Is : Light travels in a straight line.

Solution Is : You cannot see the flame of a lighted candle through a bent pipe but you can see it through a straight pipe, because light always travel in a straight line.

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