Experiments Questions and Answers

The intensity of a sound wave while passing through an elastic medium falls down to 10 as it ca one metre distance through the medium If the initial intensity of the sound wave was 100 W m2 in value after it has passed through 3 metre thickness of the medium will be Option A B C D 70 W m 72 9 W m 81 W m 60 W m Rate this qu

Q 3 An area of 144 sq cm on a map represents an area of 36 sq km on the field Find the RF of the scale for this map and draw a Vernier scale to show kilometres hectometres and decametres and to measure up to 10 kilometres Indicate on the scale a distance of 7 kilometres 5 hectometres and 6 decametres

A small ball is given some velocity at point A towards right so that it moves on the semicircular track and does not leave contact up to the highest point B After leaving the highest point B it falls at the top of a building of height R and width x x 2R All the surfaces are frictionless If the collision of ball with the building is elastic then the angle with the horizontal at which the ball will rebound from the top of the building is 60 45 30 None of these

The resistance of intrinsic 1 semiconductor decreases with the increase of temperature 2 3 Pure Si doped with trivalent impurities gives a p type semiconductor Majority carries in a n type semiconductors are holes

A symmetric I section of size 180 mm x 40 mm 8 mm thick is strengthened with 240 mm x 10 mm rectangular plate on top flange as shown is Q2 If permissible stress in the material is 175 N mm2 determine how much concentrated load the beam of this section can carry at centre of 4 m span Given ends of beam are simply supported 240 mm 8 mm thick 180 mm Figure Q2 10 mm 400 mm

4 Two forces whose magnitude are in the ratio 9 11 give a resultant of 38 N If the angle of their inclination is 30 then what will be the magnitude of each force a 19 8 N 24 2 N b 20 N 24N c 25 N 30 N d None of these

48 Two infinitely long rods are arranged on a plane making an angle with each other as shown in the figure The rod B starts to move with a uniform velocity 7 in a direction perpendicular to rod A Thus the point of intersection P moves with a horizontal velocity up Which of the following statements is true F A up increases with increasing 0 B up decreases with increasing 0 C up is independent of 0 D up is independent of v A

A spherical body of radius R consists of a fluid of constant density and is in equilibrium under its own gravity If P r is the pressure at r r R then the correct options is are A P r 0 0 3R B P r 2R 63 80 20 27 Your Answer A Answer B C

The fig shows the position time graph of a particle moving on a straight line path What is the magnitude of average velocity of the particle over 10 seconds 60 x m 40 30 20 10 1 2 m s 3 6 m s 2 6 8 bod A 10 t s 2 4 m s 4 8 m s re

Same amount of a liquid with specific heat 0 8 cal gm C at 60 C and liquid with specific heat 0 7 cal gm C at 45 C is mixed together Then the temp of the mixture may be Question Type Single Correct Type 1 44 C 2 40 C 3 53 C

1 0 1 1 1 0 1 1 0 I 1 0 1 1 1 1 0 011 0 be an adjacency matrix of a graph G Then as a join G can be expressed as 1 1 1 0 1 0 1 P P P P P P P P P P 2P P P C3 P P None of the other choices P P 2P P P C P P 0 P P3 P P P P3 P P 0

Two balanced three phase loads are connected in parallel to the three phase supply system of 220V phase to neutral The phase impedance of delta connected load is 12 230 whereas the phase impedance of star connected load is 4 45 Find the line current and total power drawn by the loads The phase sequence is abc 29 809 05 237 87 4 kW 109 05 2 37 5 87 4 kW 109 05 2 37 5 57 1 kW 809 05 2 157 5 87 4 kW

is a freely on the moon surface the weight is mainly due to moon s gravitational attraction 14 Assertion A gas filled balloon stops rising after it has attained a certain height in the sky

174 Which logic gate is represent combination of logic gate Ao o Bo Do a NAND NOR Y 2 by the following 2015 Y b AND OR

Two smooth inclined planes of angles 45 and hinged together back to back Two masses m and 3m connected by a fine string passing over a light pul ley move on the planes Show that the acceleration of their centre of mass is 5 8 g at an angle tan 1 to the horizon Fig 2 10 ig 2 10 E 45 45 3m

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 ou of the balloon at 100 cm s At an instant wher the radius of the balloon is 10 cm the induced em in the band is S 1 15 V A B Conducting band

31 The time period of oscillation of a simple pendulum in an experiment is recorded as 2 56 s 2 62 s 2 70 s 2 58 s 2 45 sec respectively Find the time period absolute error in each observation and the percentage error OR

A force F is applied on a square area of side L If the percentage error in the measurement of L is 2 and that in F is 4 what is the maximum percentage error in pressure 1 2 2 4 3 6 4 8

a 7 b 4 c 14 d 10 Thickness of a pencil measured by using a screw gauge least count 001 cm comes out to be 0 802 cm The percentage error in the measurement is 1 0 125 2 2 43 3 4 12 4 2 14

b 27 c 200 C d 250 C 4 An external pressure p is applied on a cube at 0 C so that it is equally compressed from all sides K is the bulk modulus of the material of the cube and a is its coefficient of linear expansion Suppose we want to bring the cube to its original size by heating The temperature should be raised by 2017 Main

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

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

The picture shown below a picture of vernier screw gauge Main scale or pitch is 0 5 There are 50 divisions on circular scale 9 circular scale divisions correspond to 10 ver scale divisions What is the reading R in mm Fill 10R in the OMR Vernier Scale 0 6 8 4 2 0 5 35 30 25

Diameter 1 Illustration 21 Find the thickness of the cubical object using a defective vernier calliper Main scale has mm marks divisions of vernier scale coincide with 9 divisions of main scale 1 13 8 mm tion Omm Omm 2 13 4 mm 10 10 20 20 30 30 After a cube have been put between the jaws 3 14 1 mm 4 13 0 mm

Matching This section contains TWO 02 List Match Sets Each List Match set has TWO 02 Multiple Choice Questions Each List Match set has two lists List I and List II List I has Four entries 1 11 111 and IV and List ll has Four entries P Q R and S FOUR options are given in each Multiple Choice Question based On List I and List II and ONLY ONE of these four options satisfies the condition asked in the Multiple Choice Question Answer the following by appropriately matching the list based on the information given in the paragraph A particle is projected along an inclined plane having inclination a at angle with the inclined plane If coefficient of restitution is 2 and it is given that the initial speed of particle is vo 10m s and that the particle bounces vertically upwards after 2 collisions as shown in figure then answer the questions accordingly T denotes total time of flight All units are in S I system 1 45 11 30 III a 60 IV 53 Vom s List I P B cot Q B cot R B 1 1 cot 13 3 4 13 3 12 3 S B cot List Il B atau

Question 5 Figure shows the variation of the internal energy U with the density of one mole of ideal monoatomic gas for a thermodynamics cycle ABCA Here process AB is a part of rectangular hyperbola 5U 2U 5p The work done in process AB is Options a U 20 b c SU d none of these I WEZDOPMERXzvie

ustration 15 A thin copper wire of length L increases in length by 2 when heated from T to T If a copper cube havin side 10 L is heated from T to T what will be the percentage change in i Area of one face of the cube and ii Volume of the cube

23 An object travels 20 m in 4 s and then another 20 m in next 10 s then choose the correct option 1 Average velocity for entire journey must be 20 7 2 Average speed for entire journey must be 20 m s 7 3 Average velocity for entire journey must be zero 1 m s 4 Average speed for entire journey must be zero 3 24 The distance travelled by an object starting from rest and moving with an acceleration 3 m s2 in the 3rd second is 4 15 8 10 E 3 2 1 5 m 7 13 4 m

The circular scale of a screw gauge has 50 divisions and pitch of 0 5 mm Main scale reading is 2 Find the diameter of sphere S A S B M 1 1 20 mm M NH FE NH FE E25 K K 2 1 25 mm R R

If two jaw of vernier calliper are joined then vernier scale zero is on left of main scale zero and 4th vernier scale division coincides with a main scale division then find zero error If one division of main scale equals 1 mm and 10 vernier scale divisions equals 9 main scale divisions then 1 ve error of 0 4 mm 2 ve error of 0 4 mm 3 ve error of 0 6 mm 4 ve error of 0 6 mm If electric force F and magnetic force F are given B 22

The least count of a stop watch is 0 1 sec The time of 20 oscillations of the pendulum is found to be 20 sec The percentage error in the time period is 1 0 25 2 0 5 4 1 0 3 0 75

It is often said that the world is witnessing now a second industrial revolution which will transform the society as radically as did the first List some key contemporary areas of Science and technology which are responsible for this revolution

5 The blood flows through a large artery extending from heart to lungs with a radius of 2 5 mm and 15 cm long The pressure across the artery ends is found to be 380 Pa then what is the blood s average speed Coefficient of viscocity of blood is 0 0027 Poiseulli 1 0 0286 mm s 2 0 0144 mm s 3 0 0073 mm s 4 0 00073 mm s

When a particle passes a point x y in a force field created by stationary sources potential energy of the system associated with the force field is given by equation U kx x y 2 If at a position F r i j the particle is observed moving perpendicular to 7 find the tangential and normal components of acceleration of the particle at this point

Consider the vernier calipers as shown the instrument has no zero error What is th length of the rod shown if 1 msd 1mm Us 7 msd 8 vsd Main Scale 1 2 3 4 5 6 7 8 9 1011121314 1 4 6 mm 3 4 3 mm Vernier Scale 2 4 5 mm 4 none

When the momentum of a proton is changed by an amount po then the corresponding change in the de Broglie wavelength is found to be 0 25 The original momentum of the proton was A Po

ww 252 R 1 2A 4A 2 4A 2A a 3 1A 2A 4 2A 3A 10 Two wires of same material and lengths Land 2L have areas of cross section A and 2A respectively Those joined in series and connected across a bettery The values of the electric field and drift velocity in the two w will be respectively in the ratio of 184 1 2 1 2 1 2 2 1 1 1 3 1 1 1 2 4 1 1 2 1 M A cell supplies a current i through a resistance R and a current i throufh a resistance R The inter resistance of the cell is pg 24 i R i R 1 1 1 R R 2 12 Current through 502 resistor is 3 i R 1 R 1 1 The 1 17 W 4 i 1 R 1 1