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A torch is placed at two different positions A and B, one by one, as shown in the figure.
The shape of the shadow obtained in two positions is shown in the figure.
Match the position of the torch and the shape of the shadow of the ball."
Torch position A will create a shadow (a) and torch position B will form the football's shadow (b). Here, the difference in the size of the ball's shadow (A) and (B) is due to the difference in the position of the torch from the ball at A and B.
The shadow (A) has a larger size than the ball shadow (B) simply because the screen, flashlight position A and the ball are in the same straight line.
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- A student had a ball, a screen and a torch in working condition. He tried to form a shadow of the ball on the screen by placing them at different positions. Sometimes the shadow was not obtained. Explain.
- A sheet of plywood, a piece of muslin cloth, and a transparent glass, all of the same size and shape were placed at A one by one in the arrangement shown in the figure.Will the shadow be formed in each case? If yes
- Three torches A, B, and C shown in the figure are switched on one by one.The light from which of the torches will not form a shadow of the ball on the screen."
- Examine if the following are true statements:$(i)$ The cube can cast a shadow in the shape of a rectangle.$(ii)$ The cube can cast a shadow in the shape of a hexagon.
- Observe the picture given in figure carefully.A patch of light is obtained at B when the torch is lighted as shown. Which of the following is kept at position A to get this patch of light?$(a)$. A wooden board$(b)$. A glass sheet$(c)$. A mirror$(d)$. A sheet of white paper"
- A potted plant is kept horizontally for a considerable time. The three positions of the parts A and B of the potted plant are shown in the following figures:(a) Which figure shows the correct position taken by the parts A and B of the plant?(b) What type of phenomenon is exhibited by the figure chosen in (a) above?"\n
- The positions of three elements A, B and C in the periodic table are shown below :(a) State whether A is a metal or non-metal.
- A small hole P is made in a piece of cardboard. The hole is illuminated by a torch as shown in the figure. The pencil of light coming out of the hole falls on a mirror. At which point should the eye be placed, so that the hole can be seen?$(a)$. A$(b)$. B$(c)$. C$(d)$. D"
- A simple pendulum is oscillating between two points A and B as shown in the figure. Is the motion of the bob uniform or non-uniform?"
- In the concave reflector of a torch, the bulb is placed:(a) between the pole and focus of reflector (b) at the focus of reflector(c) between focus and centre of curvature of reflector (d) at the centre of curvature of reflector
- Vivaan placed an object O at the position shown in the given figure.The characteristics of the image formed are :(a) real, inverted, and diminished?(b) real inverted and highly magnified(c) virtual, upright, and enlarged"\n
- Two blocks of iron of different masses are kept on a cemented floor as shown in the figure. Which one of them would require a larger force to move it from the rest position?"
- Observe the vessels A, B, C, and D as shown in the figure carefully.The volume of water taken in each vessel is as shown. Arrange them in the order of decreasing pressure at the base of each vessel. Explain."
- Which mirror is used as a torch reflector? Draw a labelled diagram to show how a torch reflector can be used to produce a parallel beam of light. Where is the bulb placed in relation to the torch reflector?
- A cylinder of same height and radius is placed on the top of a hemisphere. Find the curved surface area of the shape if the length of the shape be $7\ cm$.
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