Basic Physics Questions and Answers

In your laboratory you trace the path of light rays through a glass slab for different values of angle of incidence i and in each case measure the values of the corresponding angle of refraction r and angle of emergence e On the basis of your observations your correct conclusion is a zi is more than Zr but nearly equal to Ze b zi is less than r but nearly equal to Ze e zi is more than Ze but nearly equal to r d Zi is less than Ze but nearly equal to Zr

1 6 m 2 4 m 3 A bus is moving with a speed of 10 ms on a straight road A scooterist wishes to overtake the bus in 100 s If the bus is at a diatence of 1 km from the scooterist with what speed should the scooterist chase the bus H 20 ms 2 40 ms 3 25 ms 4 10 ms AIPMT Scr 2009 tiolo ctarts its motion from rest under the action of a constant force If the distance covered in first 10s is s and JAIPMT Scr 2009

will q 2 5 q 3 3 q A thin circular disk of radius R is uniformly charged with density o 0 per unit area The disk rotates about its axis with a uniform angular speed The magnetic moment of the disk is AIEEE 2011 12 1 TR ow 00 TR 4 4 2 R w rface of non condcting disc of radius R The disc rotates about an axis this rotation 3 JO

4 31 B Speeds of two identical cars are u are 4u at a specific instant The ratio of the respective distances in which the two cars are stopped in the same time RPMT 2009 1 1 1 2 1 4 3 1 8 4 1 16 man throws balls with the same speed vertically upwards one after the other at an interval of 2 seconds What should Given 98 m s

Figure shows the position of a particle moving on the x axis as a function of time 10 w 6 1 the particle has come to rest 6 times 2 the maximum speed is at t 6 sec 3 the velocity remains positive for t 0 to t 6 sec 4 the average velocity for the total period show in negative gors A and B t sec

1 7 8 m 2 78 m 3 15 6 m Two bodies are thrown vertically upward with the same initial velocity of 98 m s but 4 sec apart Hong after the first one is thrown when they meet 1 10 sec 2 11 sec 3 12 sec 4 13 sec

A rectangular coil of length 0 12m and width 0 1m having 50 turns of wire is suspended vertically in a uniform magnetic field of stength 0 2 Weber m The coil carries a current of 2A If the plane of the coil is inclined at an angl of 30 with the direction of the field the torque required to keep the coil in stable equilibrium will be NEET 2015 1 0 24 Nm 3 0 15 Nm 4 0 20 Nm 12 0 12 Nm

The following figures show some velocity V versus time t curves But only some of these can be realised in practice These are hhh n In ii iv 2 only i ii iii i Only i ii and iv iii 3 only ii and iii 4 all of them the figure The maximum

1 56 km hour 20 km hour 50 km hour 4 48 km hour A particle moves along a circle with a uniform speed v After it has made an angle of 60 the change in its speed and velocity will be 60 1 v 2 v 0 3 v 3 v 0 LERATION 2 A Buda 560 x

Four charges q q q and q are placed at the corner of square of side a as shown in the figure The net electric potential at the centre 1 4 TEO of the square will be k q a a a q a

For protecting a sensitive equipment from the extrnal magnetic field it should be 1 placed inside an aluminium can 2 placed inside an iron can 3 wrapped with insulation around it when passing current thought it 4 surrounded with fine copper sheet filed is produced

A closed loop PQRS carrying a current is placed in a uniform magnetic SR and RQ are F F and F respectively and are in the plane of the paper and along the directions shown the AIPMT 2008 directions shown the force on the segment QP is F S 1 R E

A body covered a distance of L m along a curved path of a quarter circle The ratio of distance to displacement is 2 2 2 T if he starts from one end of the track and 2 2 2 T T 3 dien 4

Soft iron is used in many electrical machines for 1 low hysteresis loss and low permeability 3 high hysteresis loss and low permeability For protecting a sensitive equipment from the extrnal magnetic field it should be 2 low hysteresis loss and high permeability 4 high hysteresis loss and high permeability

Starting with the equation of motion of a three dimensional isotropic harmonic oscillator i 1 2 3 dp dt deduce the conservation equation where kr dA dt A 0 1 2 1 P P kr r 3 2m Note that we will use the notations T T2 T3 and x y z interchangeably and similarly

The magnetic moment of a circular coil carrying current is 1 directly proportional to the length of the wire in the coil 2 inversely proportional to the length of the wire in the coil directly proportional to the square of the length of the wire in the coil 4 inversely proportional to the square of the length of the wire in the coil

A wire loop PQRSP is constructed by joining two semi circular coils of radii r and r respectively as shown in the fig Current i is flowing in the loop The magnetic induction at point O will be MH 2 Hoi 1 4 S R 3 2 1 4 H

A student very cautiously traces the path of a ray through a glass slab for different values of the angle of incidence Zi He then measures the corresponding values of the angle of refraction r and the angle of emergence e for every value of the angle of incidence On analysing these measurements of angles his conclusion would be A Zi Zr Ze B Zi Ze Zr C Zi r Ze D Zi Ze r

57 A tank full of water has a small hole at its bottom If one fourth of the tank is emptied in t seconds and the remaining three fourths of the tank is emptied in t seconds then ratio 11 is 12 a 3 c 2 2 2 b 2 d 2 3 3 BH

16 10 14C The charge to be put on a spherical conducto of radius 0 2 m to produce an electric field of 0 072 N C just above its surface is 8 10 14C hr 32 10 14C min

37 Four identical conducting plates are placed parallel to each other at equal separation as shown below B C 000 H Plates A and B are fixed while B and D are connected with the help of a conducting spring of spring constant k Initially the spring is in relaxed position and B and C are at rest now the spring is compressed slightly by displacing B and C and then plates B and C are released across PQ Mass of each plate is m a remains constant D b increases continuously c decreases continuously 1 2k d is varying sinusoidally with frequency 2 t m

To increase the current sensitivity of a moving coil galvanometer we should Question Type Single Correct Type 1 decrease number of turns in coil 2 3 decrease area of cross section of the coil increase torsional constant of spiral springs

A motor is used to deliver water at a certain rate through a given horizontal pipe To deliver n times the water through the same pipe in the same time the power of the motor must be increased as follows Question Type Single Correct Type 1 n times 2 n times 3 n times

At a point on the screen in YDSE 3rd maxima is observed at t 0 Now screen is slowly moved with constant speed away from the slits in such a way that the centre of slits and centre of screen lie on same line always an at t 1 s the intensity at that point is observed to be 3 th of maximum intensity in between 2nd and 3rd maxima The speed of screen will be D 1 m Select an answer A m s 13 B m s 12 C 2 m s D 13 m s

XY6P Vo 2 4P V 3 P V A heat engine employing a Carnot cycle with an efficiency of n 10 is used as a refrigerating maching the thermal reservoirs being the same The refrigerating efficiency is RPMT 2014 1 12 2 8 3 10 4 9 of the mixtu is 300 K If atomic mass

Q11 Air is blown through a pipe AB at a rate of 15 L min The cross sectional area o the broad portion of the pipe AB is 2 cm and that of the narrow portion is 0 5 cm The difference in water level h is density of air 1 32 kg m A a 16 mm b 1 5 mm c 10 mm d 32 mm B hi water

What is education Explain its meaning by giving suitable definitions From which word the word Education has been originated

Astronomical unit AU is the average distance between the earth and sun approximately 1 5 10 km The speed of light is about 3 0 108 m s The speed of light in astronomical unit per minute is a 0 012 AU min c 1 2 AU min b 0 12 AU min d 12 0 AU min AMU Med

30 Three forces start acting simultaneously on a particle moving with velocity v These forces are represented in magnitude and direction by the three sides of a triangle ABC as shown The particle will now move with velocity W pienst or sides letnos a Less than v b Greater than v c In the direction of the largest force BC Falm 01 B Torn

The position of a particle is given by r 3ti 2t j 1k m where t is time in second and the coefficients have the proper unit for 7 to be in metre The acceleration of the particle in m s2 at t 2 sis 1 2j 3 3i 2j 2 21 4 41

9 Two stones are thrown up simultaneously from the edge of a cliff 240 m high with initial speed of 10 m s and 40 m s respectively Which of the following graph best represents the time variation of relative position of the second stone with respect to the first Assume stones do not rebound after hitting the ground and neglect air resistance take g 10 m s The figures are schematic and not drawn to scale a b 240 240 y y m 8 y y m t s 12 12 t s

length is F The ratio F F will be a 3 4 b 2 1 c 1 2 d 2 3 NEET 2019 bast A 2001 An equiconvex lens has power P It is cut into two symmetrical halves by a plane containing the principal axis The power of one part will be P d a 0 c d P b 2 P the equivalent focal 4 DO 20

The cross sectional area of a horizontal along its length linearly as moved in the direction of flow The variation of pressure as we move along its length in the direction of flow x direction can be best represented by the following graph P P A X X P P B D X X

A viscous fluid is flowing through a cylindrical tube The velocity distribution of the fluid is best represented by the diagram 41612 particle 3412 1 2 Friction Tal de to adesive force llio hall of radius r falling in a tank of liquid at the instant when its acceleration is one 4 None of these

ate magnitude of the resultant of t forces having magnitude 100N a cting at an angle of 60 degrees 95 N 58 N CON 2 N

m Question 7 Initially spring is relaxed and m is released from rest When come to rest for a just after cutting thread moment string AB is cut at the same instant Find the acceleration of eeeeeee M B TITT A

An aeroplane flying uniformly with a speed 400 km h 1 covers a distance of 50 km in easterly direction and then 70 km in northerly direction and finally reaches back to the starting point What is average velocity of the aeroplane a 400 km h c zero b 370 km h 1 d some other value

estion 16 ort lost in friction is given by Actual effort Ideal effort Ideal effort Actual effort Actual effort Actual load Actual load Actual effort

2 Velocity 3 Frequency 1 Wavelength Prism of which material is used for study of infrared spectrum 1 rock salt 2 flint glass 3 crown glass Image formed on retina of eve is proportional to 4 None 4 quarta

BHOLE RAJWARDHAN SANJAY Question 11 From a solid cylinder 150mm in diameter and 220mm height a hole having 45mm radius and height is drilled 220mm coaxially Calculate the Y for the remaining solid O 75mm O 110mm O 128 69mm O 146 23mm

A steel wire of 1 m long and 1 mm cross section area is hang from rigid end When weight of 1 kg is hung from it change in length will be given Y 2 10 N m 1 0 5 mm 2 0 25 mm 3 0 05 mm 4 5 mm C

The potential difference V and the current I flowing through an instrument in an ac circuit of frequency f are given by V 5 cos wt volts and I 2 sin wt amperes where w 2 f The power dissipated in the instrument is Question Type Single Correct Type 1 Zero 2 10W 3 5W

mple wheel and axle diameters of wh axle are 500 mm and 100 m ctively If load of 400 N is lifted by t of 100 N calculate the efficiency of ne at this load 6

Identify the type of force system shown in following figure Note Click on image to enlarge it F F3 F2 F4 Coplanar Concurrent force system Non Coplanar Concurrent force system

the nature of surfaces in contact and on the area in contact does not depand depands O does not depand does not depand O depands does not depand depands depands Previous Save Next

19 The resultant of called as and resultant reaction Force Applied force frictional normal reaction frictional force 2 applied force the weight of the body reaction the weight of the L 4 normal body

Question 16 The volume of a sphere having 100mm as its diameter is mm 3 523598 78 261799 39 130899 69

Question 9 To apply Lami s theorem all the Three forces in the system must be coplanar collinear forces Non collinear non concurrent forces coplanar concurrent and non colinear forces coplanar non concurrent forces

Calculate magnitude of the resultant tensile forces having of two magnitude 100N and 200N acting at an angle of 60 degrees 244 95 N 264 58 N

The bulk modulus of a spherical object is B If it is subjected to uniform pressure p the fractional decrease in NEET 2017 radius is 1 B 3p 2 3p B 3 P 3B 4 PB