DAILY PRACTICE PROBLE FOR NSO for Class VII

November 2, 2018 | Author: Nilesh Gupta | Category: Reflection (Physics), Mirror, Blue, Electric Current, Battery (Electricity)
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DPP's will help u for NSO II Stage examination....

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DAILY PRACTICE PROBLEMS FOR NSO PHYSICS

DPP : 01

Class – VII

TOPIC ELECTRICITY 1.

If two ends of a wire are dipped in distilled water, the compass needle brought near the circuit (A) would keep moving in anticlockwise direction continuously. (B) would keep moving in clockwise direction continuously. (C) would remain still. (D) would show deflection

2.

Battery is having: (A) Two or more cells connected to each other in any manner. (B) Positive terminal of one cell is connected to the positive terminal of the next cell. (C) Two or more cells connected in such a way that the positive terminal of one cell is connected to the negative terminal of the next. (D) Only one cell

3.

Switch can be connected (A) to the positive terminal of the battery only. (B) any where in between the circuit elements within the circuit. (C) to the negative terminal of the battery only. (D) first to the positive terminal and then to the negative terminal of the battery.

4.

The weak current flowing in a circuit can be detected by a (A) LED (B) battery. (C) bulb.

(D) bar of metal

5.

Electric fuse contains wire that (A) can melt on passage of electric current of low voltage. (B) cannot melt. (C) can melt only on passage of electric current of high voltage. (D) electric fuse does not contain wire.

6.

The electrical process of coating an inexpensive conductor with an expensive metal is called (A) electroplating. (B) electro-refining. (C) conduction. (D) coating

7.

The bulb gets fused when (A) it becomes milky. (C) the glass breaks.

(B) the filament breaks. (D) the bulb becomes too old

A metal to be electroplated is taken as (A) cathode. (C) conducting metal solution.

(B) anode. (D) connecting wire

Graphite and aluminium are the examples of (A) semiconductors. (C) conductors.

(B) non-metals. (D) insulators

The most common semi conductor is (A) aluminium. (B) copper.

(C) iron.

8.

9.

10.

(D) silicon

11.

Carbon rods dipped in the conducting solution to pass current are called (A) rods. (B) metal rods. (C) electrodes. (D) electrons

12.

A device to check whether a particular material allows to pass electricity or not is called a (A) screw driver. (B) battery. (C) tester. (D) LED.

13.

In case of fire caused by electricity, we switch off the main switch (A) to break the circuit. (B) to complete the circuit. (C) save the power. (D) stay in dark

14.

The solution through which current is passed is called a/an (A) electrolyte. (B) electrolysis. (C) electron. (D) solution

15.

A compass needle kept near an electric circuit shows (A) no effect. (B) deflection. (C) reflection. (D) stillness

DAILY PRACTICE PROBLEMS FOR NSO PHYSICS

DPP :

02

Class – VII

TOPIC :LIGHT 1.

Sunlight consists of (A) black colour only. (B) five colours. (C) seven colours. (D) blue colour

2.

The correct sequence of seven colours of a rainbow is (A) Blue, Orange, Red, White, Purple, Yellow, Green. (B) Violet, Blue, Indigo, Green, Red, Yellow, Orange. (C) Violet, Indigo, Blue, Green, Yellow, Orange, Red. (D)Violet,Blue,Indigo,Yellow,Green,Orange,Red

3.

A kaleidoscope is (A) an optical toy. (B) a magnetic toy. (C) an electrical toy. (D) an electromagnetic toy.

4.

An image obtained by a plane mirror, the left side of an object appears to be (A) the left side of an image. (B) the right side of an image. (C) the top of an image. (D) the bottom of an image

5.

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.

6.

Objects become visible to us because (A) light is absorbed by them. (B) light is reflected by them before reaching our eyes. (C) they obstruct the path of light. (D) light passes through them.

7.

When light falls on a polished or shiny surface (A) the light is absorbed by it. (B) the direction of light changes. (C) the light gets transmitted. (D) there is no change in its direction

8.

The image formed by a plane mirror will be (A) larger (C) inverted

9.

Doctors use (A) convex mirrors (B) plane mirrors. (C) concave mirrors. (D) combination of concave and convex mirrors

(B) erect. (D) tilted.

10.

The incident ray, the normal at the point of incidence and the reflected ray all lie in (A) different plane. (B) neighboring plane. (C) same plane. (D) opposite plane

11.

In reflection, the angle of incidence is always equal to the (A) angle of reflection. (B) angle of refraction. (C) angle of emergence. (D) angle of diffraction

12.

If angle of incidence is 30 then angle of reflection will be (A) 60. (B) 120. (C) 30.

(D) 90.

13.

If the angle between incident and reflected ray is 50 than find the angle of incidence. (A) 50. (B) 30. (C) 25. (D) 100.

14.

The angle between the incident ray and the normal is known as the (A) angle of reflection. (B) angle of incidence. (C) angle of refraction. (D) angle of transmission.

15.

The angle between the reflected ray and the normal is known as the (A) angle of reflection. (B) angle of incidence. (C) angle of refraction. (D) angle of transmission

16.

If the distance between the object and its image in a plane mirror is 14.6 cm, then the distance of the object from the mirror is (A) 14.6 cm. (B) 7.3 cm. (C) 29.2 cm. (D) 10 cm

17.

An object 5 cm high is placed in front of a plane mirror. The size of the image formed is (A) 2.5 cm. (B) 10 cm. (C) 5 cm. (D) 15 cm.

18.

A candle of 10 cm is placed before 20 cm from the plane mirror. Its image formed will be (A) 10 cm high, placed 20 cm behind the plane mirror. (B) 20 cm high, placed 20 cm behind the plane mirror. (C) 10 cm high, placed before 20 cm from the plane mirror. (D) 20 cm high,placed before 20 cm from the plane mirror.

19.

Reflection from a rough surface is called (A) regular reflection. (B) diffused reflection or irregular reflection. (C) plane reflection. (D) surface reflection.

20.

The word ‘AMBULANCE’ is written in the (A) reverse order on an ambulance. (B) form of its mirror image on an ambulance van. (C) correct order on an ambulance. (D) random order on an ambulance

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