CLASS TEST CH - 11,12 (CLASS 6)

1 . Observe the picture given in fig 11.1 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?
(b) A glass sheet
(c) A mirror
(d) A sheet of white paper,

2. A student observes a tree given in figure through a pinhole camera. Which of the diagrams given in figures (a) to (d) depicts the image seen by her correctly?

3. Four students A, B, C and D looked through pipes of different shapes to see a candle flame as shown in fig 11.4.

Who will be able to see the candle flame clearly?
(a) A
(b) B
(c) C
(d) D

4 Which of the following is/are not always necessary to observe a shadow?
(a) Sun
(b) Screen
(c) Source of light
(d) Opaque object

5. Paheli observed the shadow of a tree at 8:00 a.m., 12:00 noon and 3:00 p.m. Which of the following statements is closest to her observation about the shape and size of the shadow?
(a) The shape of the shadow of the tree changes but the size remains the same.
(b) The size of the shadow of the tree changes but the shape remains the same.
(c) Both the size and shape of the shadow of the tree change.
(d) Neither the shape nor the size of the shadow changes.

6. Which of the following can never form a circular shadow?
(a) A ball
(b) A flat disc
(c) A shoe box
(d) An ice cream cone

7. Two students while sitting across a table looked down on to its top surface. They noticed that they could see their own and each other’s image. The table top is likely to be made of
(a) Unpolished wood
(b) Red stone
(c) Glass sheet
(d) Wood top covered with cloth

8. Choose from the options a, b, c and d given in the fig 12.1 which shows the correct direction of current.

9. Choose the incorrect statement.
(a) A switch is the source of electric current in a circuit.
(b) A switch helps to complete or break the circuit.
(c) A switch helps us to use electricity as per our requirement.
(d) When the switch is open there is an air gap between its terminals.

10. In an electric bulb, light is produced due to the glowing of
(a) the glass case of the bulb
(b) the thin filament
(c) the thick wires supporting the filament
(d) gases inside glass case of the bulb.

11. In the following arrangement shown in fig 12.2, the bulb will not glow if the ends A and B are connected with

(a) A steel spoon
(b) A metal clip
(c) A plastic clip
(d) A copper wire

12. In the circuit shown in fig 12.3, when the switch is moved to ‘ON’ position,

(a) the bulb A will glow first
(b) the bulb B will glow first
(c) the bulb C will glow first
(d) all bulbs will glow together

13. Filament of a torch bulb is
(a) a metal case
(b) metal tip at the centre of the base
(c) two thick wires
(d) a thin wire

14. Paheli is running short of connecting wires. To complete an electric circuit, she may use a
(a) glass bangle
(b) thick thread
(c) rubber pipe
(d) steel spoon

15. In which of the following circuits A, B and C given in fig 12.4, the cell will be used up very rapidly?

16. Correct the following statements.                                  (2)

(i) The colour of the shadow of an object depends on its colour of the object.
(ii) Transparent objects allow light to pass through them partially.

17. An electric bulb is connected to a cell through a switch as shown in fig 12.7. When the switch is brought in ‘ON’ position, the bulb does not glow. What could be the possible reason/s for it? Mention any two of them.                                                     (3)