University of Delhi 2008 B.Sc Physics (Hons.) practical - Question Paper

Time : 45 Minutes

PHYSICS-Paper VII
(Practical Lab.-I)
Maximum Marks : 15



Attempt any Fifteen ques..
All ques. carry equal marks.

1.What is
i) systematic fault
(ii) random fault ?

2.A carbon resistance has the subsequent rings
green, brown, red, gold,
What is the resistance ?

3.A mass M attached to the free end of a massless spring executes vertical oscillations of time period T. The spring is cut into 2 parts having lengths in ratio of into 1:2 .The identical mass is attached to the smaller part of the spring. What is time period of oscillations?

4.About how many points a compound pendulum has identical time period?

5. The time period (T) of a compound pendulum of length l is :

Name the parameters appearing in this relation.

6. What is the effect on the balancing length if the radius of the bridge wire used in a Carey-Foster bridge is reduced without any other change ?

7.The resistance of a platinum resistance thermometer at O°C and 100°C is· 2.000 ohm and 2.100 ohm respectively. At what temperature the resistance of thermometer is 2.150 ohm ?

8. What is the direction of thermoelectric current, at the cold junction; in a "copper-iron· "thermocouple ?

9. The resonance frequency of a series L-C-R circuit is 10 kHz. The resistance and capacitor are doubled. What,
is the resonance frequency now ?

10. A viscous liquid is flowing through a horizontal capillary tube The temperature of liquid is raised by 2O C. What is the effect on the rate of flow of the liquid.

11. A thin rod of mass M, length L is suspended from a rigid support by a wire attached to mid-point of rod. The time-period of torsional oscillations of rod is T. The rod is cut into 2 equal parts. The original rod is changed by 1 half part. The time-period of torsional
oscillations is T1. What is T/T1. ?

12. Which instrument makes use of triangulation method for the measurement of height?

13.The Lissajou's figure found in a C.R.O. is a circle. What is the ratio of amplitude and frequency of the signals ? What is the phase difference ranging from the 2 signals.

14. The vertical scale used in a C.R.O. indicates O.5V/div. The number of vertical divisions, peak-to-peak are 12. What is r.m.s. value of signal ?

15.Give the expression for gain of a non-inverting OP-AMP.

16.In a astable multivibrator tH = 15 ms and T = 20 ms. What is duty cycle of the output ?

17.What is the purpose ·of "OFF-SET" in an OP-AMP ?

18.What is open-loop voltage gain of OP-AMP 741 C ?

19. Using a 555 timer draw the circuit of a astable multivibrator

20. When is the OP-AMP stated to be operating in its linear
range ? When coos it saturate ?









~

Earning:   Approval pending.