Physical World and Measurement Quiz - ICSE Class 11 Physics

Free practice quiz: Physical World and Measurement (ICSE Class 11 Physics). 47 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 11 Physics practice quiz has 47 multiple-choice questions on Physical World and Measurement, and 47 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. A fundamental constant in physics, Planck's constant (h), relates the energy of a photon to its frequency. If the energy of a photon is given by E = hν, and the momentum of a photon is given by p = h/λ, where λ is the wavelength. What is the dimensionality of Planck's constant?

   1. [ML^2T^-1]
   2. [MLT^-2]
   3. [M^0L^2T^-2]
   4. [ML^1T^-1]
   Show answer

   Answer: A. [ML^2T^-1]

   We know that Energy (E) has dimensions of [ML^2T^-2] and Frequency (ν) has dimensions of [T^-1]. From E = hν, h = E/ν. Therefore, the dimensions of h are [ML^2T^-2] / [T^-1] = [ML^2T^-1]. Alternatively, Momentum (p) has dimensions of [MLT^-1] and wavelength (λ) has dimensions of [L]. From p = h/λ, h = pλ. Therefore, the dimensions of h are [MLT^-1] * [L] = [ML^2T^-1]. Both methods yield the same dimensions.

2. The SI unit of luminous intensity is:

   1. Watt
   2. Joule
   3. Candela
   4. Newton
   Show answer

   Answer: C. Candela

   Candela (cd) is the SI base unit of luminous intensity, measuring the power emitted by a light source in a particular direction. Watt is the SI unit of power, Joule is the SI unit of energy, and Newton is the SI unit of force.

3. Which physical quantity has the same dimensions as that of energy?

   1. Momentum
   2. Power
   3. Torque
   4. Pressure
   Show answer

   Answer: C. Torque

   Energy has dimensions [ML^2T^-2]. Momentum has dimensions [MLT^-1]. Power has dimensions [ML^2T^-3]. Torque is calculated as force times perpendicular distance (Force × distance), so its dimensions are [MLT^-2] × [L] = [ML^2T^-2]. Pressure has dimensions [ML^-1T^-2]. Therefore, Torque has the same dimensions as energy.

4. A student uses a meter scale to measure the length of a table and records it as 1.25 m. The least count of the meter scale is 1 mm. What is the percentage error in this measurement?

   1. 0.8%
   2. 0.08%
   3. 1.25%
   4. 0.125%
   Show answer

   Answer: B. 0.08%

   The least count is 1 mm = 0.001 m. The measured value is 1.25 m. The percentage error is (Least Count / Measured Value) × 100%. Percentage Error = (0.001 m / 1.25 m) × 100% = (1/1250) × 100% = 100/1250 % = 1/12.5 % = 0.08%.

5. The order of magnitude of the diameter of a hydrogen atom is approximately:

   1. 10⁻¹⁰ m
   2. 10⁻⁸ m
   3. 10⁻¹⁵ m
   4. 10⁻²⁷ m
   Show answer

   Answer: A. 10⁻¹⁰ m

   The diameter of a hydrogen atom is on the order of 1 Angstrom (Å), which is equal to 10⁻¹⁰ meters. 10⁻⁸ m would be the size of a cell. 10⁻¹⁵ m is the order of magnitude of the nucleus of an atom. 10⁻²⁷ m is roughly the mass of a proton in kg, not a length scale.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which of the following physical quantities does NOT have the same dimensions as energy?
2. A student measures the diameter of a wire using a screw gauge. The main scale reading is 2 mm, and the nonius scale is coinciding with the 5th division. If the least count of the screw gauge is 0.01 mm, what is the actual diameter of the wire?
3. The velocity-time graph of a particle is a straight line with a positive slope. What can be inferred about the motion of the particle?
4. If the error in measuring the radius of a sphere is 2%, what is the percentage error in measuring its volume?
5. Which of the following is a dimensionless physical quantity?
6. The unit of impulse is the same as the unit of:
7. In the CGS system, the unit of energy is the erg. In the SI system, the unit of energy is the joule. If 1 joule = 10⁷ ergs, and a physical quantity has a value of 50 J in the SI system, what is its value in the CGS system?
8. A physical quantity P is related to four measurable quantities a, b, c, and d as follows: P = (a³b²) / (√c d). If the percentage errors in the measurements of a, b, c, and d are 1%, 2%, 3%, and 4% respectively, what is the percentage error in P?
9. The number of significant figures in the number 0.005060 is:
10. If the velocity of a particle is given by v = (3t² + 2t + 1) m/s, what is its acceleration at t = 2 seconds?
11. Which of the following pairs of physical quantities have different dimensions?
12. The principal of homogeneity of dimensions states that:
13. Which of the following is a scalar quantity?
14. If the period of oscillation of a simple pendulum is given by T = 2π√(l/g), where l is the length and g is the acceleration due to gravity. What are the dimensions of 2π?
15. The SI unit of force is the Newton (N). 1 N is defined as the force required to accelerate a mass of 1 kg by 1 m/s². What are the dimensions of force?
16. A student measures the length of a rod to be 1.50 m. The least count of the measuring instrument is 0.01 m. What is the percentage error in the measurement?
17. The value of 'g' (acceleration due to gravity) is approximately 9.8 m/s². Express this in cm/s².
18. If the velocity-time graph is a horizontal line, it implies:
19. Which of the following is NOT a fundamental unit in the SI system?
20. The distance between two cities is measured as 300 km. Express this distance in meters using scientific notation.
21. The dimensions of the coefficient of viscosity are:
22. A car travels the first half of the distance between two points at a speed of 40 km/h and the second half of the distance at a speed of 60 km/h. What is the average speed of the car for the entire journey?
23. If the error in measuring length is 2% and the error in measuring mass is 3%, what is the percentage error in measuring density, given that density ρ = mass/volume, and assuming volume is proportional to the cube of length (volume ∝ length³)?
24. If distance is measured with an accuracy of 2% and velocity with an accuracy of 3%, what is the percentage error in the measurement of time, given that time = distance / velocity?
25. Which of the following quantities has the same dimensions as pressure?
26. The dimensions of the universal gravitational constant (G) are:
27. If the distance covered by a particle moving with uniform acceleration increases linearly with time, what is the acceleration?
28. The SI unit of electric current is:
29. Which of the following is a derived unit?
30. If the velocity of a particle is v = 2t³ - 5t + 7, its acceleration at t=1s is:
31. The distance of a star from the Earth is approximately 3 × 10¹⁶ km. Express this distance in meters.
32. Which of the following SI units is NOT correctly matched with its physical quantity?
33. A projectile is launched with an initial velocity and angle. If air resistance is ignored, which of the following statements is always true about its motion?
34. If the percentage error in the measurement of speed is 2% and the percentage error in the measurement of distance is 3%, what is the percentage error in the measurement of time, given that time = distance / speed?
35. Which of the following is a dimensional constant?
36. The velocity-time graph of a particle is a curve. This implies that the particle is moving with:
37. The SI unit of thermodynamic temperature is:
38. If the radius of a circle is measured as 4.2 cm with a possible error of ±0.1 cm, what is the percentage error in the area of the circle?
39. The number of significant figures in the measurement 0.0007030 m is:
40. Which of the following pairs of physical quantities has different dimensions?
41. The period of oscillation of a simple pendulum depends on its length (l) and acceleration due to gravity (g). If T ∝ lᵃ gᵇ, find the values of a and b.
42. The SI unit of power is:

More quizzes

• Properties of Bulk Matter▶ Play
• Work, Power and Energy▶ Play
• Gravitation▶ Play
• Heat and Thermodynamics▶ Play
• Kinematics▶ Play
• Laws of Motion▶ Play

Browse all Physics quizzes

More to play