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Class 11 Physics (Part I) Chapter 1 Physical World And Measurement Quiz 1 (25 MCQs)

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1. Radioactivity was discovered by
2. The value of one angstrom is .....
3. Round off the following numbers as indicated \{A\} 19.45 upto 3 digits \{B\} 248337 up to 3 digits
4. Gross error can be minimised by
5. The dimensional formula for magnetic flux is
6. The density of a material in CGS system of units is 4 g cm $^{-3}$. In a system of units in which unit of length is 10 cm and unit of mass is 100 g, then the value of density of material will be
7. The number of significant figures in 600 m is
8. What is the unit of Planck's constant?
9. The length of a body is measured as 3.51 m, if the accuracy is 0.01m, then the percentage error in the measurement is
10. Which of the following is a possible first step in applying the scientific method
11. A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. He makes 20 observations and, finds that the average width of the hair in the field of view of the microscope is 3.5 mm. What is the estimate of the thickness of the hair?
12. With due regard for significant figures, (12.5)$^{2}$ =
13. Light year is the unit of
14. The symbol for tera is .....
15. Which method is used to find the distance between the Earth and the Sun?
16. For detecting submarines under water SONAR makes use of:
17. What is the SI unit of weight?
18. What is the value of mass of known observable universe?
19. "The most incomprehensible thing about the world is that it is comprehensible." This statement was made by the scientist
20. Identify the physical parameters that are having the same dimensions from the below-given list:(i) Magnetic field(ii) Energy density(iii) Refractive index(iv) Young's modulus(v) Dielectric constant
21. The dimensional formula for gravitational constant G is .....
22. Length cannot be measured by
23. If the force is proportional to square of velocity, then the dimension of proportionality constant is?
24. In a vernier callipers N divisions of vernier scale coincide with N-1 divisions of main scale ( in which length of one division is 1mm). The least count of the instrument should be
25. Following are the readings obtained while measuring the diameter of a wire by using the screw gauge0 mm is the main scale reading52 divisions are the circular scale readingWhat is the diameter of the wire if 1 mm on the main scale is equal to the 100 divisions on the circular scale
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