Start learning →

Rajasthan Board Class 10 (RBSE) Science — practice by topic

Browse 415 questions across 28 Science topics. Choose what you want to revise, then open a question to check its answer and worked solution.

Start learning Rajasthan Board Class 10 (RBSE) with Quill →

Science topics

Light - Reflection and Refraction (57)Life Processes (46)Science (44)Our Environment (33)Chemical Reactions and Equations (32)The Human Eye and the Colourful World (32)Electricity (30)Carbon and its Compounds (29)Metals and Non-metals (29)How do Organisms Reproduce (28)Acids, Bases and Salts (26)Acids Bases Salts (26)Metals & Non-metals (14)Light (13)C10humaneye (11)C10reproduction (10)C10magneticeffects (8)C10heredity (5)Biology (2)Class10 Chem Reaction Types (2)Class10 Chem Redox Energy (2)Class10 Electricity Basics (2)Class10 Electricity Circuits (2)Class10 Life Nutrition Respiration (2)Class10 Life Transport Excretion (2)Class10 Light Lenses (2)Class10 Light Mirrors (2)Magnetic Effects of Electric Current (1)

Try a Science question

Two lenses of power +5 D and −2 D are placed in contact. The focal length of the combination isRead the answer and worked solution →A 10 mm pin in front of a concave mirror forms a real, inverted 5 mm image at 30 cm in front of the mirror. The focal length of the mirror isRead the answer and worked solution →The refractive index of a medium is 1.5. The speed of light in that medium is (c = 3×10⁸ m/s)Read the answer and worked solution →The magnification produced by a plane mirror isRead the answer and worked solution →

Worked practice questions

Two lenses of power +5 D and −2 D are placed in contact. The focal length of the combination is

  1. 50 cm
  2. −33.3 cm
  3. 33.3 cm
  4. 20 cm
Show answer and solution

Correct answer: C. 33.3 cm

Powers add in contact: $P=+5-2=+3$ D. $f=1/P=1/3\,\text{m}=33.3$ cm (converging).

Open this question →

A 10 mm pin in front of a concave mirror forms a real, inverted 5 mm image at 30 cm in front of the mirror. The focal length of the mirror is

  1. 30 cm
  2. 10 cm
  3. 15 cm
  4. 20 cm
Show answer and solution

Correct answer: D. 20 cm

$m=h'/h=-5/10=-0.5=-v/u$ with $v=-30$, so $u=-60$ cm. $\frac1f=\frac1v+\frac1u=-\frac1{30}-\frac1{60}=-\frac{3}{60}\Rightarrow f=-20$ cm. Magnitude 20 cm.

Open this question →

The refractive index of a medium is 1.5. The speed of light in that medium is (c = 3×10⁸ m/s)

  1. $4.5 \times 10^8$ m/s
  2. $3 \times 10^8$ m/s
  3. $2 \times 10^8$ m/s
  4. $1.5 \times 10^8$ m/s
Show answer and solution

Correct answer: C. $2 \times 10^8$ m/s

$n=c/v \Rightarrow v=c/n=(3\times10^8)/1.5=2\times10^8$ m/s.

Open this question →

How to practise

  1. Choose a Science question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.