For above network, equivalent resistance between points $A$ and $B$ is $..........$
- ✓$45 \Omega$
- B$15\Omega$
- C$5 \Omega$
- D$22.5\Omega$
Answer: A.
View full solution →Question types
the human eye and the colourful world question types
254 questions across 7 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
254
Questions
7
Question groups
5
Question types
01
M.C.Q
47 Q→02Fill in the blank
20 Q→03True-False
12 Q→04[1 Mark Questions]
90 Q→05[2 Mark Questions]
38 Q→06[3 Mark Questions]
21 Q→07[4 marks Questions]
26 Q→Sample Questions
the human eye and the colourful world questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
For above network, equivalent resistance between points $A$ and $B$ is $..........$
Which light has maximum speed in glass?
- AViolet
- BBlue
- CGreen
- ✓Red
Answer: D.
View full solution →Out of the following, which light is deviated minimum in the dispersion of white light through a glass prism?
- AGreen
- BViolet
- ✓Yellow
- DDispersion of the given three colours is the same.
Answer: C.
View full solution →A person has a defect of vision. His far point is $1.5 \ m$. It means$......$
- ✓he cannot clearly see objects at a distance more than $1.5 \ m$ from the eye.
- Bhe can clearly see objects at a distance more than $1.5 \ m$ from the eye.
- Che cannot clearly see objects at a distance less than $1.5 \ m$ from the eye.
- Dhe suffers from far$-$sightedness.
Answer: A.
View full solution →A person has a defect of eye vision. His near point is $40 \ cm$. It means$......$
- Ahe cannot clearly see objects at a distance more than $40 \ cm$ from the eye.
- Bhe can clearly see objects at a distance of $40 \ cm$ only.
- ✓he can clearly see objects at a distance equal to $40 \ cm$ or more from the eye.
- Dhe can clearly see objects at a distance less than $40 \ cm$ e.g., $25 \ cm$ from the eye.
Answer: C.
View full solution →At night as we move up in the atmosphere of the earth, the refractive index ............... continuously. (decreases, some, increases)
In the normal situation in the relaxed position of the ciliary muscles, the eye lens is............... (thick, thin, equal)
The distance between the eye lens and the retina is known as the..........
The diameter of the human eyeball is approximately............. cm. $(2.4, 2.3, 2.5)$
View full solution →In the spectrum of white light,............and............. colours seen at the two ends. (red, blue, violet, green)
A myopic person has the far point nearer than infinity.
The speed of light decreases as it passes from an optically denser medium to an optically rarer medium.
Far-sightedness can be rectified by using a concave lens of suitable power.
The splitting of white light into its constituent colours is called the scattering of light.
The near point of every person is $25 \ cm.$
View full solution →How do resistance and resistivity of metallic wire depend on temperature ?
Give symbol of variable resistance.
In which type of connection of resistors, current passing through each resistor is same?
How much is the equivalent resistance of a series connection?
What is the least distance of distinct vision?
An electric bulb is connected to a $220\ V$ generator. The current is $0.50\ A$. What is the power of the bulb?
View full solution →Which of following pairs, is not correct regarding its use ?
View full solution →| Instrument | Use | |
| $(a)$ | voltmeter | to measure potential difference |
| $(b)$ | ammeter | to measure current |
| $(c)$ | galvanometer | to detect current |
| $(d)$ | resistance | to provide energy to the circuit |
An electric iron of resistance $20 W$ takes a current of $5 A$. Calculate the heat developed in $30 s$.
View full solution →How can three resistors of resistances $2 \Omega, 3 \Omega$, and $6 \Omega$ be connected to give a total resistance of $4 \Omega$ ?
View full solution →How does a cell or a battery cause current in the electric current ?
Using an example of electric bulb, explain how electric heating is used to produce light.
Why does the cord of an electric heater not glow while the heating element does ?
Which law gives relation between potential difference across a metallic wire and current through it ? Describe it in brief.
Define potential difference. Mention its $S I$ unit and give its definition also.
View full solution →How is electric current expressed ? Describe about its $SI$ unit also.
View full solution →Why do stars twinkle?
Make a diagram to show how hypermetropla is corrected. The near point of a hypermetropic eye is $1 ~m$. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is $25 ~cm$.
View full solution →Why is the clear sky blue?
Give the reason for the advanced sunrise and delayed sunset.
A rainbow is an example of dispersion of sunlight. Justify this statement by explaining, with a neat labelled diagram, the formation of a rainbow in the sky. List two essential “conditions for observing a rainbow.
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