NCERT Class 10 Science — Chapter 2: The Human Eye and the Colourful World

What is the result when a second identical prism is placed in an inverted position with respect to the first prism in the path of a dispersed spectrum?

Due to atmospheric refraction, by approximately how much time is the sunrise advanced relative to the actual geometric sunrise?

Which instrument is used to measure the electric current flowing through a circuit?

What is the shape of the current-voltage (I-V) graph for an ohmic conductor at constant temperature?

Assertion (A): Red light deviates the least when passing through a glass prism. Reason (R): The speed of red light in glass is maximum among the colours of visible light.

In the context of refraction through a glass prism, what is the angle between the incident ray and the emergent ray called?

Which phenomenon explains the visibility of light paths through the canopy of a dense forest on a misty day?

What is the primary cause of the apparent flattening of the Sun’s disc at sunrise and sunset?

Which gases are typically used to fill electric bulbs to prolong filament life?

Which vision defect is characterized by a near point that has receded beyond the normal distance of 25 cm, while the far point remains at infinity?

What is the commercial unit of electrical energy consumption?

Which symbol represents the SI unit of electrical resistance?

How is electric potential difference between two points defined?

A charge of one coulomb is equivalent to the charge contained in approximately how many electrons?

What is the standard value for the least distance of distinct vision for a normal human eye?

What is the conventional direction of electric current in a circuit?

Assertion (A): A person suffering from hypermetropia cannot see nearby objects clearly. Reason (R): In a hypermetropic eye, the image of a nearby object is formed behind the retina.

Which of the following statements is/are correct regarding atmospheric refraction? 1. The apparent position of a star remains constant due to steady atmospheric conditions. 2. It elevates the apparent position of stars near the horizon.

What is the term for the angle between the two lateral faces of a triangular prism?

How is a voltmeter connected in a circuit to measure the potential difference across a component?

Which alloy is commonly used in heating elements and resistance wires?

Which device is used to measure the electric potential difference between two points in a circuit?

Which metal is predominantly used for the filament of incandescent electric bulbs?

Which one of the following is the SI unit of electric charge?

What is the magnitude of the elementary charge carried by an electron?

Which one of the following is the SI unit of electric current?

How is an ammeter connected in a circuit to measure the current flowing through a component?

Which one of the following is the SI unit of electrical resistance?

The electrical resistance of a uniform metallic conductor is directly proportional to its:

The electrical resistance of a uniform metallic conductor is inversely proportional to its:

Which one of the following is the SI unit of electric power?

Consider the following statements regarding the near and far points of a normal human eye: 1. The near point is typically about 50 cm for a young adult with normal vision. 2. The far point is infinity. 3. Objects between the near point and the far point are seen clearly. Which of the statements given above is/are correct?

Which one of the following is closest to the average diameter of the human eyeball?

Which phenomenon is responsible for the Sun being visible slightly before actual sunrise?

Which optical phenomenon is responsible for the visibility of sunbeams (crepuscular rays) in a misty forest?

Under which condition does the path of a light beam become visible?

Assertion (A): To an astronaut in space, the sky appears blue. Reason (R): Scattering of light does not take place in the absence of an atmosphere.

Consider the following statements: 1. The emergent ray from a rectangular glass slab is perpendicular to the incident ray. 2. The emergent ray from a glass prism is generally deviated from the direction of the incident ray. Which of the statements given above is/are correct?

Which one of the following optical phenomena is NOT involved in the formation of a rainbow?

Which component is responsible for maintaining a potential difference across a circuit?

When white light passes through a glass prism, which one of the following colours undergoes the least deviation?

Which component is primarily used to regulate current in a circuit without changing the voltage source?

Assertion (A): Planets do not twinkle like stars. Reason (R): Planets reflect sunlight rather than emitting their own light.

Which of the following materials possesses the lowest electrical resistivity?