The paper of chapters 1&2 the first year
Chapter 1 and two
Student Name:____________________Roll No.___________
Class: 1st Year Subject Name: Physics 11
I) Solve these numerical 4 Marks
1. The position of two aeroplanes at any instant is represented by two points A( 2,3,4) and B(5,6,7) from an origin O in km (i) what are their position vectors? (ii) Calculate the distance between the two aeroplanes.
II) SELECT the correct option: 20 Marks
1. The sum of two or more vectors is equal to a single vector which is called
a) unit vector b) product vector c) Resultant vector d) Null vector
2. A vector which has magnitude one is called
a) scalar vectors b) Unit vector c) Resultant vector d) Position vector
3. The branch of physics " wave mechanics " introduced by
a) Eienstien b) Max Plank c) De - Broglie d) Bohr
4. If a vector is multiplied by negative number (n<0) then its direction is changed by: a) b) 9 c) 6 d) 18
5. Meter is the basic unit of
a) length b) mass c) force d) velocity
6.SI unit of time was redefined in
a) 1960 b) 1967 c) 1900 d) 1983
7. The SI unit of amount of substance is
a) Joule b) Mole c) Volt d) Ohm
8.The number of significant figure in is
a) 8 b) 7 c) 5 d) 2
9.when a vector is divided by its magnitude we get
a) x-axis b) Unit vector c) Zero vector d) Position vector
10.what is travel time Moon to Earth
a) 1 min 20s b) 2 min 20s c) 1 min 25s d) 1 min 30
11. Plasma is .....................
a) 4th state of mater b) highly ionized d=state c) both d) None of these
12. Two-lined are drawn at a right angle to each other are known as
a) y-axis b) XY -axis c) coordinate axis d) components
13. The circumference of the earth was determined by
a) Ibn - al-Haitham b) Bohr c) Chadwick d) Al-Beruni
14. The basic units in system international (SI) units are
a) Three b) Five c) Two d) seven
15. Number of second in a day is :
a) 86400 sec b) 9000 sec c) 3600 sec d) 43200 sec
16.Resultant of two vectors of magnitude 24 and 25. The angle between them is :
a) b) c) d)
17. The system international (SI) built up from
a) Derived units b) Basic units c) Supplementary units d) all of these
18. Null Vector is a vector having zero magnitudes and
a) arbitrary direction b) No direction c) Specific direction d) Opposite direction
19. The angle between A CROSS B and B cross A is :
a) pi b) 2pi c) pi /2 d) pi /4
20.One atto is
a) 10 raised to the power minus 10 b) 10 -18 c) 10-20 d) None of these
III) Write short answers to these questions: 16 Marks
1.Define uncertainties ?
2. Write the name of torque unit?
3. Add the given masses in kilogram up to appropriate precision, 2.189, 0.089, 0.089, 11.8 and 5.32.
4. Name the supplementary units?
5. What are the rules of rounding off the significant figure?
6. Show that the expression is a dimensionally correct.
7. Write down the two uses of dimensional analysis.
8. Write the dimensions of Density.
IV) Write detailed/long answers to these questions: 4 Marks
1. The period of a simple pendulum is measured by a stopwatch. What type of errors is possible in the time period?
papers of classes 9th,10th,11 and 12 year
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