Question

HALF YEARLY EXAMINATION-2020
Sub:- Physics(CHSE)
Class: +21" year Science
Time: - 2 Hours
E.M:- 50
Q.1. Answer All the questions
11 15-51
a) What is the dimensional formula of surface Tension?
DIM 2° 6) (MºLT-?) TID) (M'L°T') iv) (MLT-")
b) What is unit of Angle?
1) Metre
it (Metre) im) Unit less iv) Radian
c) Which of the following measurement is most precists
DS 00 mm in) 5.00 cm
im) S m iv) 5.00 km
d) IPR are physical quantities having Jillcrent dimensions which of the following combinations is not
meaningful quanuty,
iv) PQ R
c) A dimensionless quantity
1) Never has a unit iD) Always has a unit wi) May have a unit Iv) Does not exist
Q.2. Anwer all the questions
1113-31
a) A body thrown venically upwards what is the acceleration at the highest point?
b) What is the average velocity of a man who completes a rotation in a circle?
c) Two walls of masse M & M (
MM) are thrown vertically upward with same initial speed which
Ons will rise to the greater height
Q-3. Answer all the questions
11 13 - 3)
vector
a) U-
Erg
b) A Vector whose initial point is fixed is called
c) The arta under velocity time graph represent
GROUP-B
Q.4. Any five
12x 5 = 10)
a) Test if the following cquation is dimensionally correct or not
T-21
Where g = Acceleration due to gravity
L = Length of the Pendulum
b. Find the dimension of plank constant in the equation E-bv.
Ehere. E = Energy , h - plank constant, V-Frey
c. If the displacement of a body is zero, is the distance conver by it necessily zero? Comment with suitable
illustration
d) A car covers the first half of the distance between two places at 40 km/h & another half at 60 km/h, then
What is the average speed of the car
e) State and explain Principle of Homogeneity.
1) A body stars from rest & acquires a velocity of 12 m/s in 5 sec Calculate the acceleration & the distance
Travel
g) Explain why we cann't have a body with absolute motion on mot
Q.5. Any five
13:5 - 15
a) is an expriment using vemier callipere the length of cylinders was found to 2.11.2.12 2.1). 2.10
Cakute the Reuve om
h) Young's modules of steel 519 10 N/M. Express this in CGS stem using dumunal analysis
Spend​

Answer 1

Answer:

गयरेजरजै गटेजेर तोचैकाक दैक्षािसकेत गाचे्लाक तैक्षोसे्रतै कक्ष्कं ताक्ष्स्कैेच ैकैतेककैककैेर्तै क्सोॉलेै ्लगक् ास्क्त््ल