**School Name: Himalaya Public School, Sector 13, Rohini, Delhi 110085 India**

Time: 40 Minute

**Marks: **20

**Class: 11th Class**

Subject: Physics

**Date: 21/8/2019**

## NCERT 11th Class CBSE Physics Unit Test 2019

**Question**: 1. It the units of force and length each are doubled then how many times would the unit of energy be affected? [1]

**Question**: 2. Give the dimensional formula of: [1]

- Gravitational Constant
- Work and Energy

**Question**: 3. What is electro magnetic force? mention its important properties give some examples of the electro magnetic force. [2]

**Question**: 4. Find the dimensions of a×b in the in the relation *P* = *b* – *x*^2/at where P is power x is distance and T is time. [2]

**Question**: 5. Assuming that the mass m of the largest stone that can be moved by a flowing river depends upon ‘V’ the **velocity**, ‘P’ the density of water and on ‘g’ the acceleration due to gravity show that **m** varies with the sixth power of the velocity of the flow. [5]

**Question**: 6. in successive measurements the readings of the period of oscillation of a simple pendulum mas found to be 2.63, 2.56, 2.55, 2.42, 2.49, 2.53, sec in an experiment. [5]

#### Find:

- mean value of the period of oscillation
- absolute error in each measurement
- mean absolute error
- Relative error and
- Percentage error form

**Question**: 7. Fill in the blanks: 11th Physics Test 2019

- The surface area of a solid cylinder of radius 2 cm and height 10 cm is equal to _____ (nm)² (find both) [1]
- 10
^{-9} corresponds to?

10^{-18} corresponds to? [2]
- Taking velocity time and force as the fundamental quantities, find the dimensions of mass in terms of V, t, F. [2]

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