DAILY PRACTICE PROBLE FOR NSO for Class X

DAILY PRACTICE PROBLEMS FOR NSO DPP : 01

PHYSICS

Class – X

TOPIC : ELECTRICITY 1.

If a charged body attracts another body, the charge on the other body : (A) must be negative or zero (B) must be positive (C) must be zero (D) may be positive, negative or zero

2.

Gold leaf electro-scope is device to : (A) detect current (B) measure voltage (C) Detect charge & identifying its polarity. (D) none of these

3.

Coming of live wire and neutral wire in direct contact causes : (A) short-circuiting (B) over loading (C) no damage

(D) unknown effect

4.

Assuming that the charge of an electron is 1.6 x 10–19 C, the number of electrons passing through a section of wire per second, when the wire carries a current of 1 A is : (A) 0.625 x 1019 (B) 1.6 x 10–19 (C) 1.6 x 1019 (D) 0.625 x 1017

5.

For a metallic conductor, voltage versus current graph is drawn at two different temperatures T1 and T2. From the graph it follows :

(A) T1 = T2 (C) T1 < T2 6.

What is the resistance between A and B in the following circuit.

(A) 1  7.

(B) T1 > T2 (D) nothing can be decided

(B) 12 

(C)

1  2

(D)

3  2

In the given circuit, the effective resistance between points A and C will be — (DPP-3/VIII)

(A) 0.5R

(B) R

(C) 2R

(D) 5R

8.

9.

The resistors R1 and R2 are connected in :

(A) series in both circuits

(B) parallel in both circuits

(C) series in circuit I and parallel in circuit II

(D) parallel in circuit I and series in circuit II

There three resistance wires having resistances 5, 6and 8 are connected in parallel to a battery of 15 V and of negligible resistance. The potential drop across 6resistance is (A) 10 V

10.

(C) 20 V

(D) 8 V

In the circuit shown in Figure, the reading of the voltmeter V will be :

(A) 4 V 11.

(B) 15 V

(B) 2 V

(C) 6 V

(D) 3 V

If two bulbs, whose resistance are in the ratio of 1 : 2, are connected in series. The power dissipated in them has the ratio of : (A) 1 : 1

12.

(B) 1 : 2

(C) 2 : 1

(D) 1 : 4

An electric heater of 1500 Watt is switched on for 10 hours. The electric energy consumed by the heater is – (A) 5.4 × 107 J

(B) 3.6 × 107 J

(C) 1.8 × 107 J

(D) 0.9 × 107 J

DAILY PRACTICE PROBLEMS FOR NSO PHYSICS

DPP : 02

Class – X

TOPIC : LIGHT 1.

2.

Identify the wrong image formation : (A)

(b)

(c)

(D) None of these

State true or false :(i) (ii) (iii) (A) TTT

Laws of reflection are valid only for plane surfaces A ray of light retraces its path after reflection in case of normal incidence Glance angle of incidence is always equal to angle of reflection. (B) FTF (C) FTT (D) FFT

3.

When an object is moved from C to F of a concave mirror then its image will move from : (A) C to F (B) C to infinity (C) F to C (D) C to 2C

4.

Which of the following statement is correct : (A) In refraction angle of incidence can never be equal to angle of refraction (B) Normal is the line drawn perpendicular to the interface of two media (C) When a ray of light goes from water to air it bends towards the normal (D) None of these

5.

Lateral shift varies inversely to :

6.

(A) wavelength

(B) refractive index

(C) incident angle

(D) none of these

For the figure given below which of the following statements is correct : A i1 P

B

Q

r1

i2

Glass S

C

Air

R r2 lateral displacement D

(A) i1 = r2 (C) Incident and emergent rays or parallel 7.

(B) i1  r2 (D) Both A and C are correct

If a graph is plotted between 1/v and 1/u, for a convex lens, which one of the following graph is approximately correct ?

1/v

1/v 1/v

(A)

(B)

I/u

1/v

(C)

I/u

(D)

1/u

1/u

8.

A convex lens made of glass of refractive index 1.5 is dipped into a liquid of refractive index 1.4 as shown in figure below. It will behave as :

=1.4 (A) an invisible object (C) a divergent lens

(B) a convergent lens (D) a glass slab

9.

A fish in water sees an object 24 cm above the surface of water. The height of object above the surface of water that will appear to fish is : (A) 32 cm (B) 8 cm (C) 24 cm (D) 18 cm

10.

Which physical quantity remains unchanged in the refraction of light ? (A) Wavelength (B) Velocity (C) Frequency

11.

Why does a diamond shine so brightly ? (A) Due to refraction (C) Due to reflection

(D) Both (A) and (C)

(B) Due to total internal reflection (D) None of these

12.

Three medium P, Q and R have refractive indices 1.3, 2.1 and 1.4 respectively. If light rays goes from medium Q to medium R, then angle of refraction will be : (A) less than the angle of incidence (B) equal to the angle of incidence (C) greater than the angle of incidence (D) either greater or less than the angle of incidence

13.

A bulb is placed at a depth of 2 7 m in water and a floating opaque disc is placed over the bulb so that the bulb is not visible from the surface. What is the minimum diameter of the disc : (A) 5m

14.

15.

(B) 10 m

(C) 12 m

(D) 14 m

When a ray of light enters a lens : (A) Wavelength decreases (C) Frequency decreases

(B) Wavelength increases (D) Frequency increases

When the light is very bright, then : (A) iris makes the pupil expand

(B) iris makes the pupil contract

(C) iris and the pupil remain as they are

(D) None of these