Experiments Questions and Answers

3 330 K and 268 K 4 310 K and 248 K m an Three perfect gases at absolute temperature T T and T are mixed The masses of molecules are m m and the number of molecules are n n and n respectively Assuming no loss of energy the final temperature of th mixture is AIEEE 2011 1 T T T 3 nT n T n T n n n 3 n T n T n T n T n T n T 4 nT nT nT n T n T n T

Iwo resistance are measured in ohm and is given as R 32 2 R 62 3 When they are connected in parallel the percentage error in equivalent resistance is B D 3 4 5 0 67 2 33

In a YDSE experiment the two slits are covered with a transparent membrane of negligible thickness which allows light to pass through it but does not allow water A glass slab of thickness t 0 41 mm and refractive index 1 5 is placed infront of one of the slits as shown in the figure The separation between the slits is d 0 30 mm The entire space to the left of the slits is filled with water of refractive index 4 3 water Uw 4 3 S 0 30 Slit g Scree O 5000A is being incident on the sl A coherent light of intensity I and absolute wavelength making an angle 30 with horizontal If screen is placed at a distance D 1 m from the slits find a the position of central maxima b the intensity at point O

The density of material in CGS system of units is 4g cm In a system of units in which unit of length is 10cm and unit of mass is 100g when the value of density of material in this system will be 1 0 4 2 40 3 400 4 0 04

26 If in a p n junction diode a square input signal of 10 V is applied as shown AI 5V Then the output signal across RL will be 5V 1 SV 2 n n 10 V T 3 10 V

An elasticized conducting band is around a spherical balloon as per figure such that its plane passes through the centre of the balloon A uniform magnetic field of magnitude 0 04 T is directed perpendicular to the plane of the band Air is let out of the balloon at 100 cm s 1 At an instant when the radius of the balloon is 10 cm the induced emf in the band is B Conducting band

A wheel having mass m has charges q and q on diametrically opposite points It remains in equilibrium on a rough inclined plane in the presence of uniform vertical electric field E A mg 9 B mg 2q C mg tan 0 2q D none q

Zero Marks 0 In all other cases 3 Put a uniform meter scale horizontally on your extended index fingers with the left one at 0 00 cm and the right one at 90 00 cm When you attempt to move both the fingers slowly towards the center initially only the left finger slips with respect to the scale and the right finger does not After some distance the left finger stops and the right one starts slipping Then the right finger stops at a distance XR from the center 50 00 cm of the scale and the left one starts slipping again This happens because of the difference in the frictional forces on the two fingers If the coefficients of static and dynamic friction between the fingers and the scale are 0 40 and 0 32 respectively the value of x in cm is

The time dependence of a physical quantity P is given by P P exp a t where a is a constant and t is time The constant a 1 dimensionless 2 has dimensions T 2 3 has dimensions of P 4 boo imension T2

Two perfectly black parallel planes 1 2 by 1 2 m are separated by a distance of 1 2 m One plane is maintained at 800 K and the other at 500 K The plates are located in a large room whose walls are at 300 K What is the net heat transfer between the planes 1

A physical quantity X is related to four measurable quantities a b c and das given X abd 2 The percentage error in the measurement of a b c and d are 1 2 2 and 4 respectively What is the percentage error in quantity X a 15 b 17 c 21 d 23

Percentage errors in the measurement of mass and speed are 2 and 3 respectively The error in the estimation of kinetic energy obtained by measuring mass and speed will be a 8 b 2 c 12 d 10

66 The period of oscillation of a simple pendulum is T 2 Measured value of L is 10 cm known L to mm accuracy and time for 100 oscillations of the pendulum is found to be 50 s using a wrist watch of Is resolution What is the accuracy in the determination of g a 2 b 3 c 4 d 5

Subjective Put a uniform meter scale horizontally on your extended index fingers with the left one at 0 00 cm and the right one at 90 00 cm When you attempt to move both the fingers slowly towards the center initially only the left finger slips with respect to the scale and the right finger does not After some distance the left finger stops and the right one starts slipping Then the right finger stops at a distance XR from the center 50 00 cm of the scale and the left one starts slipping again This happens because of the difference in the frictional forces on the two fingers If the coefficients of static and dynamic friction between the fingers and the scale are 0 40 and 0 32 respectively the value of XR in cm is 2020

The radius of curvature of a concave mirror measured 12 h by a spherometer is given by R 6h 2 The values of 1 and h are 4 0 cm and 0 065 cm respectively where I is measured by a meter scale and h by a spherometer Find the percentage error in the measurement of R Ans 8

2A student measured the length of the pendulum 1 21 m using a metre scale and time for 25 vibrations as 2 min 20 sec using his wrist watch absolute error in g is a 0 11 ms c 0 44 ms 2 b 0 88 ms d 0 22 ms