English Medium कक्षा १० - CBSE Question Bank Solutions for Science

The deviation of light ray from its path when it travels from one transparent medium to another transparent medium is called ______.

The angle of incidence for a ray of light having zero reflection angle is ______.

Which of the following does not belong to the same homologous series?

Successive members of a homologous series vary by how many atomic mass unit?

C₃H₈ belongs to the homologous series of ______.

An electric iron draws a current of 4 A when connected to 220 V mains. Its resistance must be:

A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of:

A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross-section of the filament in 16 seconds would be roughly:

The heating element of an electric iron is made up of:

An electric bulb is connected to a 220 V generator. The current is 0.50 A. What is the power of the bulb?

Which of the following gases are filled in electric bulbs?

Assertion: Bending of wire decreases the resistance of the electric wire.

Reason: The resistance of a conductor depends on length, thickness, nature of material and temperature of the conductor.

If a beam of red light and a beam of violet light are incident at the same angle on the inclined surface of a prism from air medium and produce angles of refraction r and v respectively, which of the following is correct?

The angle of incidence from air to glass at the point O on the hemispherical glass slab is.

In the above diagram light is travelling through different media. It is noted by a scientist that ∠1= ∠3 = ∠4 but ∠2 < ∠1. Which of the following statement would be correct?

Noor, a young student, was trying to demonstrate some properties of light in her Science project work. She kept ‘X’ inside the box (as shown in the figure) and with the help of a laser pointer made light rays pass through the holes on one side of the box. She had a small butter-paper screen to see the spots of light being cast as they emerged.

Her friend noted the following observations from this demonstration:

1. Glass is optically rarer than air.
2. Air and glass allow light to pass through them with the same velocity.
3. Air is optically rarer than glass.
4. Speed of light through a denser medium is faster than that of a rarer medium.
5. The ratio: sin of angle of incidence in the first medium to the ratio of sin of angle of refraction in the second medium, gives the refractive index of the second material with respect to the first one.

Which one of the combinations of the above statements given below is correct.

Which of the following does not belong to the same homologous series?

The first member of alkyne homologous series is

Name the following :-

The cell organelle where photosynthesis occurs

A pencil when dipped in water in a glass tumbler appears to be bent at the interface of air and water. Will the pencil appear to be bent to the same extent, if instead of water we use liquids like, kerosene or turpentine. Support your answer with reason.