Basic Physics Questions and Answers

A solid cylinder rolls without slipping down a 30 slope The minimum coefficient of friction needed to prevent slipping will be b 0 18 a 0 192 c 0 15 d 0 2 42 Three sta and To appears a T c T 43 A body to v in

Pressure depends on distance as P exp where x 3 are constants Z is distance K is Boltzmann s constants and e is temperature The dimension of B are A MOLOTO B M L T 1 C MOL TO D M L T Your Answer A Answer C Solution 1 xz KO X Ke Z K E dis tan ce ML T 2 L MLT 2

The wavelength of the first spectral line in the Balmer series of hydrogen atom is 6561 The wavelength of the second spectral line in the Balmer series of singly ionized helium atom is O 1215 O 1640 O 2430 A

In the given figure two tiny conducting balls of identical mass n and identical charge q hang from non conducting threads of equa length L Assume that is so small that tan 0 sin 0 then fo equilibrium x is equal to

gestion No 2 me parallax of a heavenly body measured from two points diametrically opposite on equator of earth is 2 arc minute If radius of earth is 6400 km the distan eavenly body from earth is O 1 1 10 m O 1 9 1010 m 0 2 2 1010 m 3 7 1010 m

A cargo company is trying to minimize the time taken to transport boxes from one container to another Currently two workers are pushing each along the floor from one container to the other Which of the following steps will minimize the time taken by the two workers to move a box i sprinkling sand on the floor ii loading more items in each box iii polishing the bottom of the box iv moving the box by loading it on a trolley v creating grooves at the bottom of the box only i and ii only iii and iv

a State Gauss s law in electrostatics Show that with help of suitable figure that outward flux due to a point charge Q in vacuum within gaussian surface is independent of its size and shape b In the figure there are three infinite long thin sheets having surface charge density 20 20 and a respectively Give the magnitude and direction of electric field at a point to the left of sheet of charge density 20 and to the right of sheet of charge density 0 20

Q 17 O O 5 1022 s On bombarding us by slow neutrons 200MeV energy is released If the power output of atomic reactor is 1 6 MW then the rate of fission will be 5 10 6 S 1 4 8 10 S 1 1 00 13 O

4 Formation of Ice on The Surface of Ponds or Lakes 0 C temperature of the atmosphere AMERA p density of ice 0 5 L Latent heat of fusion of ice K Thermal conductivity of ice or Temp pL t x 2 x 2K0 X Initial thickness Final thickness x P2 Ziza dx

Question No 5 The lengths of two cylindrical rods are measured as 5 62 0 01 cm and 4 34 0 02 cm What is maximum percentage error in measurement of difference of lengths of two cylinders O 1 6 2 34 O1 95 View in English O 3 16

A ball is moving with speed 20 m s collides with a smooth surface as shown in figure The magnitude of change im th 1 2 11 velocity of the ball will be 500 1 10 3 m s 40 3 m s biloob anaog v 20 m s 30 30 v 20 m s Smooth horizontal surface vom vs bosga iw gnivoM 2 20 3 m s 4 40 m s

c pgh 36 The angle subtended by the vector A 4 33 12k with the x axis is a sin b sin d cos c cos lid cylinder rolls without slipping down a 30

V If one mole of an ideal gas goes through the process A B PB and B C Given that T 400 K and T 400 K If then find the heat supplied to the gas a 2059 2 J b 3659 2 J c 223 PA 5 2

A perfectly conduction metal plate is placed in x y plane in a right handed coordinate system A charge of 32 2 columbs is placed at coordinate 0 0 2 Eo is the permittivity of free space Assume 1 j k to be unit vectors along x y and z axes respectively At the coordinate 2 2 0 the electric field vector E Newtons Columb will be N 0 0 2 0 0 0 32 2 Columbs y 2 2 0 X Perfectly conducting

C remains constant D none of A balloon of mass M with a light rope having monkey on the rope is in equilibrium If the monkey starts moving up with acceleration a w r t rope Then the acceleration of centre of mass of the system is a M m A M m B Zero aM C a B M

will be 1 80 cm 2 40 cm 2 V 2 3 neet prep A 4 167 5 The variation of output potential Vo with input potential V in a transistor in CE mode can be best represented as 1 High Yielding Test Series Part Test 7 Contact Number 9667591930 8527521718 www 0 89 D 1 3 A 2 0 3 A 3 5 A 4 0 5 A www 0 40 ww 0 20 www 1 5V 0 10 D Page 2 169 A Zener diode is used to obtain a constant voltage If applied voltage V changes then V is more than Zener voltage www

1 A uniform wire of length 20 m and weighing 5 kg hangs vertically If g 10 ms then the speed of transverse waves in the middle of the wire is a 10m c 4 ms b d 10 2 ms 2 ms

Determine the velocity of the load W in mm s if the hoisting drum draws in cable at the constant rate of 260 mm s Note There are 2 cables es W Answer Relation between V A and V B Relation between V W and V B Relation between V A and V W

Q 2 O 3 4 days O The half life of Bi20 is 5 days What time is taken by 7 8 part of the sample to decay O 10 days 15 days 4 love 1 00 16

An electric bulb is rated 220 V and 100 watt of bulb when operated on 110 volt Resistance will be Question Type Single Correct Type 1 2 3 4 121 Q 484 Q 25 Q 242 Q

d 4 5 28 A stone is thrown horizontally with velocity The velocity of the stone 0 5 s later is 3u 2 The K b value of u is a 2 2 ms d c 4 4 ms 29 The dimension of the quantity 3 3 ms1 1 1 ms 1 Z Auct 33

Dayanara has 3 poster size pictures that she wants to put on her door but only 2 pictures will fit She has a picture of her dog a picture of her hamster and of a super cool guitar How many different ways can she arrange the posters

The block has been placed on an inclined plane The block slides down the plane at constant speed Angle m by the inclined plane with vertical is 0 The coefficient of kinetic friction is 1 tan 0 2 cot 0 3 sin 0 4 cos 0

In the given diagram two long parallel wires carry equal currents in opposite directions Point O is situated midway between the wires and the X Y plane contains the two wires and the positive z axis comes normally out of the plane of paper Direction of magnetic field B at O is along X d 1 Z Question Type Single Correct Type x y and z axis X axio X 2d X d

Activity 3 A spring mass damper system has the following equilibrium equation d y dy dt 3 40y 0 t 0 dt where y t displacement in meters and t time in seconds 3 a Determine the general solution of y t 3 b 3 c Assuming y 0 0 and y 0 1 determine the particular solution of y t Use Laplace transform to solve the given differential equation with the same initial condi in 2 b 3 d 3 e Comment on how your mathematical solution behaves in transient and steady state region Build a Simulink block model suitable for generating the results of the DE Show the mo and the results in your report and specify the transient and steady state regions Make sur submit the simulation file properly named 3 f Assuming that the right hand side of the given equilibrium equation is changed from 0 to repeat parts 3 abcd and e

Look at the figure which depicts three vectors in a two dimensional plane One grid step is u In grid steps how large is the magnitude of the sum of the three vectors k 10 Between Ou and 2u Between 2u and 4u Between 4u and 6u Between 6u and 8u Between 8u and 10u Between 10u and 12u q

Q 14 Moderate O 0 04 mA In a common base amplifier circuit calculate the change in base current if that in the emitter current is 2 mA and a 0 98 1 96 mA 4 1 0 98 MA 00 06 O 7 000

Two tuning forks A and B give 4 beats per second when sounded together The frequency of A is 320 Hz When some wax is added to B and it is sounded with A 4 beats per second are again heard The frequency of B is 1 212 Ja 2 316 H7 3 324 Hz 4 328 Hz

The total weight of a piece of wood is 6 kg In the floating state in its 1 3 part remains inside the water On this floating wood what maximum weight is to be put such that the whole of the piece of wood is to be downed in the water O 12 kg O 10 kg O 14 kg O 15 kg

a 2 18 N c 4N d 6 N J5 The radii of two columns in a U tube are r and r When a liquid of density p angle of contact is 0 is filled in it the level difference of liquid in two arms ish The surface tension of liquid is g acceleration due to gravity Pehrr 2 2 1 1 c 2 7 pghn b d pgh 24172 pgh 2 1 1 thy the vector A 41 31 12k

ladder 7 65 m long leans against the side of a building If the ladder is inclined at an angle of 70 0 to the horizontal what is the horizontal distance from the bottom of the adder to the building

A 5 F capacitor is charged fully by a 220 V supply It is then disconnected from the supply and is connected in series to another uncharged 2 5 F capacitor If the energy change during X the charge redistribution is J then value of 100 X to the nearest integer is

A disk and a sphere of same radius but different masses roll off on two inclined planes of the same altitude and length Which one of the two objects gets to the bottom of the plane first Question Type Single Correct Type 1 2 3 Disk Sphere Both reach at the same time their

A particle moves in x y plane according to rule x a sinot and y a cost The particle foll 1 an elliptical path 2 a circular path 3 a parabolic path 4 a straight line path inclined equally to x and y axis

A hammer of mass 1 kg having speed of 50 m s hit an iron nail of mass 200 g If specific heat of iron is 0 105 cal g C and half the energy is converted into heat the raise in temperature of nail is 7 1 C 9 2 C O 10 5 C O 12 1 C

1 Below is a parallelogram ABCD Consider each given information and answer the following questions B m C 1 If m2D 80 find m2B 2 If mA 110 find m B 3 If AD 11 cm how long is BC 4 If DE 9 cm and AE 8 cm What is the length of DB AC 5 Given m ADC 50 and mzDCA 35 a What is the m DAC b What is the m ACB c What is the m BAC

The temperature of argon kept in a vessel is raised by 1 C at a constant volume The total heat supplied to the gas is a combination of translational and rotational energies Their respective shares are 1 60 and 40 2 40 and 60 4 100 and 0 5007 d 50

A planet is revolving in an elliptical orbit around the sun Its closest distance from the sun is r and the farthest distance is R If the velocity of the planet nearest to the sun be v and that farthest away from the sun be V then v V is a R c R T b FIR d r R

20 The increase in length of a wire on stretching is 0 025 If its Poisson s ratio is 0 4 then the percentage decrease in diameter is b 0 02 d 0 04 a 0 01 c 0 03 planet ir revolving in an elliptical orbit around the

The coefficient of static friction between the two blocks shown in figure is u and the table is smooth Wha maximum horizontal force F can be applied to the block of mass M so that the blocks move together 1 Mg 2 M M m g m 3 M m g F 4 umg

4 10000 N An aircraft executes a horizontal loop at a speed of 720 km h with its wings banked at 15 What is the radius of the loop 15 0 2679 1 1 4km 2 10km 3 14 9km 4 30km

A particle is projected vertically upwards from the surface of the earth radius Re with a speed equal to one fourth of escape velocity What is the maximum height attained by it from the surface of the earth 16 15 OR 15 R R OP

4 None of the above A lift of mass 1000 Kg which is moving with acceleration of 1m s in upward direction then the tension developed in s which is connected to lift is 1 9800N 2 10800N 3 11000 N 4 10000 N

In a 20 m deep lake the bottom is at a constant temperature of 4 C The air temperature is constant at 10 C If the thermal conductivity of ice is 4 times that of water Neglecting the expansion of water on freezing the maximum thickness of ice will be 11 m 200 11 m O 20 m 0 10 m

45 200 In a YDSE experiment if a slab whose refractive index can be varied is placed in front of one of the slits then the variation of resultant intensity at mid point of screen with will be best represented by 1

In the system shown in figure all surfaces are smooth Rod is moved by external agent with acceleration 9m s vertically downwards Acceleration of the wedge will be 10 kg a 9 m s 37 1 2

A container of large uniform cross sectional area A resting on a horizontal surface holds two immiscible non viscous and in compressible liquids of densities d and 2d each of height H 2 as shown in figure The container in open to atmosphere A tiny hole of area S A is punched on the vertical of container at a height 18 H H 2 H 2 17 Initial speed of efflux of liquid at the hole is A 3H 4h V2 H 2 3H 4h g 2 C 3H 4h h A B g 3H 4h C 2g 3H 4h D g 3H 4h The horizontal distance travelled x by the liquid initially is A B h D 4X 3H 4h h 2 3H 4h h 3

given an The nt of 17 Two particles of masses 1 kg and 3 kg have position vectors 21 31 4k and 21 31 4k respectively The centre of mass has a position vector a 3j 2k 3j 2k b 1 31 2k c d 3 2k

A particle is moving with a velocity v 21 3 at an instant of time If a force F 41 6 5k acts of particle at that instant then the radius of curvature of the particle at the instant is mass of the particle is 1 3 m 2 5 2 m 3 2m 4 7 1 m

139 A 500 F capacitor is charged at the steady rate of difference between the plates of the capacitor to 100 C s How long will it take to raise the potential 10 V a 5 s 40 A ball of ma b 10 s 50 s 8 d 100 s C moves from a nint B