Basic Physics Questions and Answers

Two hockey players of opposite teams whil e trying to hit a hockey ball on theground col lide and become entangled One has a mas s of 65kg and was moving with a velocity 7 m s while the other has a mass of 55kg an d wasmoving faster with a velocity 10m s t owards the first player In which direction an d with what velocity will they move after the y become entangled

8 10 pts The 75 kg man who almost fell 75m into the crocodile pit is still in danger when his friend Justin Thyme shows up to help Thinking quickly Justin ties a 90kg boulder to the other end of the rope and pushes it off the cliff The pulley starts spinning from rest and the hanging person Rick is pulled to safety The disk shaped pulley has a mass of 15 kg and a 0 70m diameter O Using the concepts of energy and or momentum not acceleration a How fast is Rick moving when he reaches the top of the cliff b Write an equation for angular momentum conservation for the pulley

A composite string is tied between two fixed walls as shown in the figure Both the strings are made of the same material and have a radius of cross section in ratio 2 1 and lengths in ratio 1 2 A pulse of amplitude 10mm is travelling from left to right the the amplitude of transmitted and reflected wave is 10 a mm 3 b 6 20 mm mm 3 10 3 mm 10 C 3 20 mm 3 mm 20m 3 10 d m 3 mm mm

A Due to the force of magnitude magnitude 120N applied on the jockey pulley the top of the slack side of the belt engages the smaller pulley horizontally It is understood that the tension in the slack side of the belt remains the same at both ends of the inserted jockey pulley Diameters are respectively m 780 mm for the driven pulley and d 330 for the driver with a coefficient of friction of and 0 28 between the belt and each pulley Pulleys are mounted on parallel axes kept x 1 25m apart Angle 0 75 between the radius tangential to the belt and the horizontal is not to be confused with contact angles Analyse the belt drive system and calculate The contact angles of the open belt drive without the jockey pulley are respectively Od rad on the driver side and m The take up pulley keeps the top lack side of the belt horizontal on top of the driver pulley resulting in a modified contact angle of rad at the driver pulley O The lingar or As a result of the reaction of of magnitde 120N due to the take up pulley the tensile force in the slack side of the belt is F2 N and the tension in the tight side of the belt N of the helt is rad on the machine driven side m s and a total power of kW is transmitted

ne mole of an ideal gas does 3150 J of work on its surroundings as it expands isothermally to a final pressure of 1 00 atm and volume of 48 0 L a Determine the initial volume of the gas in m m 3 b Determine the temperature of the gas in K K c What If What is the final volume of the gas in m at a final pressure of 1 00 atm if the work done by the gas on its surroundings is halved 3 m d What is the final volume of the gas in m at a final pressure of 1 00 atm if the work done by the gas on its surroundings is doubled

The first known veterinary hospital of the world was erected by the great Emperor Ash a The first known veterinary hospital of the world had been erected by the great Ashoka b The great Emperor Ashoka erected the first known veterinary hospital of the w c The great Emperor Ashoka had erected the first known veterinary hospital of t d The first known veterinary hospital of the world is erected by the great Emper

Directions Q Nos 1 20 In the following questions fill in the blanks with the most appropriate word 1 We a should c will 2 Gold and silver metals 3 She 4 a were c have 7 a ask c got 5 You a would c will 6 The roof a must c might a Ought to c Should try again if they say b can d would chicken a Would c May precious b has been d are me stop the car b made d tell you please go there b Will d Must go and talk to them b shall d must repair b ought to d needs they rather have fish or b Can d Might 8 She soon in the town 9 10 a became c grown a May c Could she walk when she was two b Can d Would you be blessed with a daughter a Must c May 11 I thought it a might c ought to 12 They enough time a would c dare 13 Sugar is a growing c make 14 Her sister 15 I the richest woman b got d had b Should d Can rain b must d need not panic there is a could b shall stop me a can c will b should d can scarcer speak French c can d will help her and you shall not b getting d get b might d would

45 Two particles of mass m constrined to move along the circumference of a smooth circular hoop of equal mass m are initially located at opposite ends of a diameter and given equal velocity vo shown in the figure The entire arrangement is located in gravity free space Their relative velocity just before collision is A V Vo C Vo 2 To H Vo B Vo 3 2 D None of these

The magnetic field in the cylindrical region shown in figure increases at a constant rate of 20 mT sec Each side of the square loop ABCD has a length of 1 cm and resistance of 4 02 Find the current in the wire AB if the switch S is closed A 1 25 x 10 7A anti clockwise 1 25 x 10 7A clockwise 2 5 x 10 7A anti clockwise 2 5 x 10 7A clockwise

A block is kept on a frictionless inclined surface with an angle of inclination d The incline is giver an acceleration a to keep the block stationary Then a is equal to O O O g gtana g tana

1 Spot the error and my sister were in no mood off talk a My sister and I were in no mood of talk b My sister and I were in no mood to talk c I and my sister were in no mood to talk d I and my sister voted no mood for talk

Three forces starts acting simultaneously on a particle moving with velocity 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 A O O B v remaining unchanged Less than

Equation of motion of projectile in x y plane is y ax bx then the angle of projection with bolx axis is bagnially NCERT Pg 78 nisi blga to 1 tan b pame of bihev 3 cos b of Joaqeen 4 sin a ylioolev ille stol sequ ne vr 2 tan a TX 7X016

Consider two blocks A m 2 kg and B m 4 kg connected with the help of strings and spring force constant k 400 N m as shown in the figure If all strings and pulley are ideal and system is in equilibrium then g 10 m s m 2 kg T T B m 4 kg

Four small objects each of mass m are fixed at the corners of a rectangular wire frame of negligible mass and of sides a and b a b If the wire frame is now rotated about an axis passing along the side of length b then the moment of inertia of the system for this axis of rotation is WB JEE 2013 a 2ma 4ma c 2m a b 2m a b b d

A 12 kg mass package is in a non atmosphere asteroid of 1 7 x 10 14 kg mass and 2 000 m radius The package is released with a powerful spring whose stiffness is 315 N m After being thrown it is observed that the package has a speed of 3 0 m s when it is at a distance of 5 000 m from the center of the asteroid Calculate how much the spring was compressed to launch the package

21 A chamber containing a gas was evacuated till the vacuum attained was 10 14 m of Hg If the temperature of the chamber was 30 C the number of molecules that remains in it per cubic metre is a 3 2 10 1 b 3 2 10 2 pr m c 2 3 10 d 2 3 10 0 Langsun

The average value of the squared speed does not equal the square of the average speed To verify this fact consider three particles with the following speeds v1 2 20 m s V2 4 32 m s and v3 8 09 m s Calculate a the average value of the squared speed and b the square of the average speed 71

An automobile travels on a straight road for 40 km at 30 km h It then continues in the same direction for another 40 km at 60 km h What is the average velocity of the car during its 80 km trip a 30 km h c 40 km h b 50 km h d 60 km h

Manjit wants to donate a rectangular plot of land for a school in his village When he was asked to give dimensions of the plot he told that if its length is decreased by 50 m and breadth is increased by 50 m then its area will remain same but if length is decreased by 10 m and breadth is decreased by 20 m then its area will decrease by 5300 m Based on the given information answer the following questions 6 The equations in terms of x and y are A x y 50 2x y 550 C x y 50 2x y 550 7 Which of the following matrix equation is represented by the given information A B 20 59 1 50 550 50 550 C 8 The value of x length of rectangular field is A 150 m C 200 m 9 The value of y breadth of rectangular field is A 150 m C 430 m B x y 50 2x y 550 D x y 50 2x y 550 0 How much is the area of rectangular field A 60000 sq m C 30000 m D B 400 m D 320 m B 200 m D 350 m B 30000 sq m D 3000 m 50 550

A Coast Guard Station A is located 150 miles south of Station B A ship at sea sends an SOS call that is received by each station The call to Station A indicates that the ship is located N55 E The call to Station B indicates that the ship is located S60 E a How far is each station from the ship B 6001 55 A Station A distance Station B distance b If a helicopter capable of flying 150 miles per hour is dispatched from the station nearest the ship how long will it take to reach the ship from the station nearest the ship

What should be the minimum coefficient of static friction between an inclined plane and the solid cylinder for which the cylinder does not slip on the inclined plane 1 sine sil 3 3 tane 3 2 sine 3 sir 3 4 tane 3

A rectangular thin plate of dimension 3m x 4m is balanced on the fulcrum as shown above Find the resultant moment of force a 9Nm clockwise b 9Nm anticlockwise c 5Nm anticlockwise d 6Nm clockwise

Consider 3rd orbit of He Helium using non relativistic approach the speed of electron in this orbit will be given K 9 10 constant Z 2 and h Planck s constant 6 6 x 10 34 Js 3 0 x 108 m s 2 92 x 106 m s O 1 46 x 106 m s 02 58 hr miny 072 106

C a mass a I 9 a Social Science 5 Physics Biology d Chemistry of Natural Science doesnat include Imeter is the length of Path travelled by light in vacauim during a 299 972 458 b 149 896 229 299 792 854 9 c 6 15mm a second of a of a of a a second of wire is time intoual 5 The resistance measured as 6 0 57 Johm The absolute error in 9 secong oya a second b 67mm d 162mm 11 The pain of quantities same dimensions having 9 Acceleration momentum 6 Wark Torque 1 Time frequency wardingth 10 measurement of resistance is b 0 30hm d 0 20hm 1491896 427 3 which of the following expresses the most accurate measurement of 8 The value of 994 1 3 acc to beat length of rod binomial theorem is 600 Imm 097 9 46 b 9 98 101 9 9 9 1 21 0 03 ohm C 0020hm 17 The value of the Product of two measured quantities 414 4 and qu upto Correct Singnificant figure is 9 3 9x104 3 6X163 4 of the error in the measurement 9 The value of area of a splure is 2p then there for o Calculation of mavinum errore in volume will be b 389 36 36853 F of 270 in radian an 3 in C 30 4 d 3p

Two forces of magnitude 50 newtons N and 20 N act on an object at angles of 30 and 45 with the positive x axis as shown in the figure Find the direction and magnitude of the resultant force that is find F F F F i i Simplify your answer including any radicals Use integers or fractions for any numbers in the expression 30 459 F F2 20 N 50 N

c hydrolysis 44 Acetic anhydride reacts with diethyl ether in the presence of anhydrous AlCl3 to give a ethyl acetate c methyl acetate b methyl propionate d propionic acid

Sri Chaitanya IIT Academy 16 If 1 1m b 4m h 2m then which of the following option is correct A A P BU C R D T 4 SOB K COW DAS 26 12 2021 Jr Super60 Jee Adv 2019 P2 WTA 18 Q P B A P B S CR D T D 4 ORSUCRDT

Obtain the expression for the generalized momentum for the relativistic particle when the Lagrangian of this particle is L U Here y is the Lorentz factor and U is the mc Y potential energy A B C D mx mx mx 2mx

A square conducting loop of resistance 102 and side 10 cm is moved with a constant velocity partly inside a magnetic field of 2 Wb m2 directed into the paper as shown in the figure The loop is connected to a network of five resistors each of resistance 40 A steady current of 0 1 A flows in the loop If speed of the loop K V m s Calculate K 2 X X X X x x X x X XX X X x X X X HE X x X X X wwwwww

2 3 An electric field of 10 V cm is applied to a specimen of silicon at 300 K doped with 1022 donors cm Given that the thermal velocity is 105 cm s compare the drift and thermal velocities for conduction band electrons At what value of the field strength will these be comparable Anaction 2 2 nainte

In class B commutation which of the following components are used O Diode Capacitor Inductor and Auxiliary Thyristor O Resistor Capacitor Inductor and Auxiliary Thyristor Resistor Capacitor Inductor Diode and Auxiliary Thyristor Capacitor Inductor and Auxiliary Thyristor

eles right angle tunnel ABO is made inside the earth from surface to its centre as shown in the figure The distance between the R and B and that between the points B and O where R is the 2 3 of earth The surface of tunnel is assumed to be frictionless A small of mass mo is released from point A The collision between the and the tunnel is assumed to be perfectly inelastic Take mass of M Radius of earth R 6400 km and g 10 m s Now answer the ng questions A

What is the total anode current of SCR in the equivalent circuit from the two transistor T1 T2 analogy of SCR The sum of base current of T1 collector current of T2 The sum of both the collector current The sum of base current of T2 collector current of T1 The sum of both the base currents

40 If due to air drag the orbital radius of the earth decreases from R to R AR AR R then the expression for increase in orbital velocity Av is b a AR GM 2 VR c AR GM R AR GM 2 VR d AR GM R

Question No 37 Single Correct A A A wedge of mass M placed on smooth surface a another block of mass m released at top of wedge on smooth curve surface Then centre of mass of system A Always stationary B Moves towards right Moves towards left M m Marks 4 00 1 00

Q6 An iron ring of cross sectional area 6 cm2 is wound with a wire of 100 turns and has a saw cut of 2 mm Calculate the magnetising current required to produce a flux of 0 1 mWb if mean length of magnetic path is 30 cm and relative permeability of iron is 470 A N 100 2 mm 0 1 mWb 470 30 cm a 6 cm

4 Two point like charges q 4 0 nC and q2 1 0 nC occupy fixed positions in free space If at every point on a curve surrounding the charges as shown in the figure net electrostatic potential V created by these charges is 900 V what should the separation between the charges be 91 92

A small ball of mass m can move in a vertic al plane along a semicircle of radius with out friction The ball is given a speed of 2g downwards from point 4 The normal force acting on the ball as it reaches point B in kmg Thon k in

What is true for a DIAC Firing angle can be changed by changing the gate voltage The firing angle can be changed by changing the supply voltage O Firing angle can be changed by changing the gate current The firing angle is fixed

DIAC and TRIAC both are semiconductors devices and conduct in O Both conducts in forward direction Both conducts in either direction DIAC conducts in forward direction and TRIAC conducts in reverse direction Both conducts in reverse direction

i Number of animals x1000 140 120 100 80 60 40 20 Predator Prey Relationships Arctic Fox vs Snowshoe Hare WWW www 0 1925 1935 1945 1955 1965 1975 Snowshoe hare Arctic fox 1985 1995 2005 Which organism is a predator ii The graph shows that shortly after the population of hares increases the population of wolves increases Explain why iii Predict and Explain in detail what would happen to the wolf populatio

In order to trigger the PUT into the on state current is passed from the to the and the anode potential must be V higher than the gate Cathode Anode 0 7 Anode Gate 0 6 As Anode Gate 0 7 Cathode Gate 0 6

Newton s rings are formed by light reflected normally from a plano convex lens and a plane glass plate with liquid between them The diameter of n ring is 2 18 mm and that of n 10 ring is 4 51 mm Calculate the RI of the liquid given that the radius of curvature of the lens is 90 cm and wavelength of light is 5893 A

Identify the Correct statement regarding Schottky diode You can select multiple correct options Reverse voltage rating are limited to about 1000V and forward current rating vary from 1A to 300 A These are characterized by very fast recovery time and low forward voltage drop It use metal to semiconductor junction for rectification purpose These are characterized by very fast recovery time and high forward voltage drop

Two small toy cars A and B are at rest at reference line of straight two lane road Car A starts at 0 with constant acceleration 1 m s2 attains a maximum velocity 8 m s and then moves on miformly Car B starts at t 4sec and wants to overtake A in minimum time Maximum speed and maximum acceleration of car B is 12 m s and 3 m s2 respectively Maximum lead of car A over B is 8 m Maximum lead of car A over B is 12 m Car B overtakes A after moving for 10sec Car B overtakes A after moving for 6sec

is 63 A block placed at the bottom of rough incline i projected upwards with some initial speed Calculate the retardation of the block while moving up 1 g sin0 cos 0 3 g u cos0 sin0 0 2 g sin0 cos0 4 g usine cose

Statement 1 In power MOSFET when gate is open no current will flow from drain to source Statement 2 When gate is positive with respect to source is no electric field establishment in MOSFET Statement 2 is true Statement 1 is true Statement 1 and 2 both are true Statement 1 and 2 both are false there

On an open ground a motorist follows a track that turns to his left by an angle of 60 after every 500 m Starting from a given turn specify the displacement of the motorist at the third sixth and eighth turn Compare the magnitude of displacement with the total path length covered by the motorist in each case olution IV 60 At III turn Displacement Distance IOA AB BCI IOCI 500 cos 60 500 500 cos 60 ber 1 500 500 500 1 1 12 1000 m So I Displacement 1000 m from O to C 500 500 500 1500 m 60 60 CI 60 500m 60 60 BAII VIII 500m AX60 500m VII Displacement 1000 2 1500 Distance

A spherical hole is made in solid sphere of radius R The mass of the sphere before hollowing was M The gravitational field at the centre of the hole due to the remaining mass is A zero B GM 8R R C GM 2R D GM R