Basic Physics Questions and Answers

Consider four conducting materials copper tungsten mercury and aluminium with resistivity Pc PT PM and PA respectively Then 1 PA PT Pc 2 PC PA PT 3 PA PM Pc

1 A smooth sphere of mass 1 kg is moving with horizontal speed of 3 m s strikes perpendicularly with a vertical wall and bounces off the wall with horizontal speed of 2 m s What is the coefficient of restitution between sphere and wall 1 3 3 MIN IN 2 2 DIN 117 3 10 1 A Is to b 1 3

A stone is thrown vertically upwards from cliff with velocity 5m s It strikes the pond near the base of cliff after 4s The height of cliff is Question Type Single Correct Type 1 2 3 4 6 m 60 m 40 m 100 m

2 A rod AB is supported by a cable BC as shown A vertically downward load of 100 KN is applied at B If the cable has a cross sectional area of 500 mm and it is made of A 36 steel determine the stress in the cable Also determine the vertical deflection of point 8 20 C A 14m B 50

If the block shown in figure is displaced slightly and released find the time period of oscillations of the block eeeeeeee ellele e Question Type Single Correct Type m 11 T 2 t 2 T 2 3 5m T K 3m K T 2 t

A car is moving towards a building with speed 10 m s At any instant the angle of elevation of the building is 30 after 5 sec the angle of elevation of the building becomes 45 then height of building is 50 A h B h 3 1 20 3 1 C h D h 20 3 1 50 30 1

3 cos 3 4 4 cos 4 3 1 Find the magnitude of the unknown forces and Y if sum of all forces is zero 5 1 5 and 10 3 5 and 5 539 90 10 2 10 and 5 4 10 and 10

2 If a vector is rotated by any angle keeping its tail fixed then select correct option 1 Magnitude of vector must change 2 Direction of vector may change 3 Direction of vector must change 4 Magnitude of vector may change

A current I Ioet is flowing in a circuit consisting of a parallel combination of resistance R and capacitance C The total charge over the entire pulse period is SAJ as the C Io B D WB JEE 2016 210 2 e ox

1 A body accelerates uniformly from rest to a velocity of 1 ms 1 in 15 seconds The kinetic joule when time t LO 2 9 is equal to take mass of body equal to 1 kg 1 10 s 2 4 s 3 12 s 4 8 s The energy of the body will be

A physical quantity y a b cd4 1 4 has four observables a b c and d The percentage error in a b c and d are 1 3 4 and 5 respectively The error in y will be 1 6 2 11 3 16 4 320

A sphere is attached to an inextensible string of 6 length 0 5 m whose upper end is fixed to ceiling The sphere has mass of 0 2 kg and is made to describe horizontal circle of radius 0 3 m The speed of sphere is 1 1 5 m s 3 2 5 m s 2 0 6 m s 4 1 8 m s 3

V GM VR the escape velocity as Where G Gravitational constant R Radius M Mass Dimensional Formula of G M L T The equation is 1 Dimensionaly incorrect 2 Dimensionaly correct 3 Numerically correct tegram

A particle executes SHM with angular frequency w starting from its mean position at 0 Its velocity is 3bo when it is at a distance b from the mean position The time taken by the particle to move from b to the extreme position on the same side is 5T 60 TU 30 FIS

2 The following forces act at a point i 20 kN towards the north ii 25 kN inclined at 30 towards the north west lii 30 kN inclined at 45 towards south west

A container whose bottom has round holes with diameter 0 1 mm is filled with water The maximum height in cm upto which water can be filled without leakage will be what Surface tension 75 x 10 N m and g 10 m s 1 20 cm 2 40 cm 3 30 cm 4 60 cm

7 A charge q is to be distributed on two conducting spheres What should be the value of the charges on the spheres so that the repulsive force between them is maximum when they are placed at a fixed distance from each other in air 1 2 and 9 2 9 3 and 29 3 3 2 9 1 and 4 05 and 3q 4 4q 5 C

A position vector of magnitude 10 units makes an angle 53 with a position vector B of magnitude 6 units The magnitude of position vector AB and the angle it makes with is 1 8 units 180 37 2 10 units 37 3 10 units 53 4 8 units 53

A ring of wire with radius 2 00 cm and resistance 0 600 Q is located in a uniform magnetic field B that is perpendicular to the plane of the loop At t 0 the magnetic field has magnitude Bo 5 00 T The magnetic field then decreases according to the equation B t Boet where T 0 500 s What is the induced current I when t 2 00 s 9626 m

21 There are two vectors A and B if B KA where k is any positive constant number then select correct option K 0 1 Direction of both A and B will be different 2 Magnitude of B must be greater than A 3 Both vectors are orthogonal to each other 4 Magnitude of B may be greater than A 2

Q A simple pendulum oscillates in air with time period T and amplitude A As the time passes UP CPMT UP CPMT 2004 A T and A both decrease B Report Error T increases and A is constant

for A ray of light is incident at an angle of incidence i on one face of a prism of angle A assumed to be small and emerges normally from the opposite face It the refractive index of the prism is the angle of incidence i is nearly equal to AIPMT Prelims 2012 1 ARAG 2 244 3 A

forces act at a point O as shown in the figure and if O is in equilibrium then the value of 9 P are 1 15 10 2N 2 450 10 N 3 75 10 2N 4 90 20 N P 10N 0 45 10 N 10 2 N

A 2 B 1 2 C 2 D 5 24 If A 21 3 k and B 3 1 4k then projection of A on B will be 3 A B C There are two vectors 25 D 3 and B 24 FS 0 A 2 A 21 31 B 4 A dxf you ar B 1 2 26 B C 2 D 5 B 31 1 4 d A r D

Imagine a change in the famous story of the hare and the tortoise In this new story when the hare wakes up he finds the tortoise xo 10 0 km ahead moving with a constant velocity The hare not ready to give up starts running again with a constant velocity In its effort to win it overcomes this distance in time t but during this time the tortoise crawls further a distance x the hare overcomes x in time t2 but the tortoise in this time crawls further a distance x2 This situation continues repeatedly A monkey who was the referee measures only distance x3 0 08 m and time t7 1 28 x 107 s Assuming the hare and the tortoise as particles find their speeds How long after the hare og up will it wit

Dave Kunst is the first person verified to have completely circled the entire earth on foot in 4 years Les ssume he traveled in a perfect circle around the earth and the center of his circle is same as the cente he earth If he traveled through a tunnel through the center of the earth penetrating to other side of ea at the same average speed how much time would he have taken a 4 55 years C 3 55 years b 2 years d 1 27 years

on 1 Nature of substance 2 Temperature of the substance 3 Mass of the substance 4 Both 1 and 2 An aluminium sphere of mass 47 gm is at 100 C It is then transferred to 140 gm copper calorimeter containing 250 gm of water at 20 C In steady state the temperature of water rises by 3 C What is specific heat of aluminium if that of copper is 386 J kg K NCERT Pg 286 1 911 J kg 1 K 1 2 516 J kg K 1 3 312 J kg K 1 4 612 J kg K 1 10 Two ideal gas thermometers A and B use oxygen and hydrogen gas respectively Following observation were made Temperature 9 NCERT Triple point of water heat of a substance depends NCERT Pg 284 Normal melting point of sulphur Pressure thermometer A 1 25 x 105 Pa 1 797 x 105 Pa Pressure thermometer B 2 x 10 Pa 2 87 x 10 Pa What is absolute temperature of normal melting point of sulphur as read by A and B respectively 1 392 69 K 391 98 K 2 362 3 K 378 6 K 3 378 4 K 375 4 K 4 387 5 K 386 3 K 11 Boiling water is converti atmospheric pressure Th now being utilised to ch liquid state to vapour s condition specific heat of 1 Less than zero 2 Zero 3 Slightly greater than ze 4 Infinite 12 Certain amount of heat is c copper to increase its temp If same amount of heat is water then rise in its Specific heat of copper water 4200 J kg K 1 4 C 3 6 C 2 4 13 When 150 gm of ice at C 300 gm of water at 50 C in resulting temperature is L 3 34 x 105 J kg Sw 1 2 7 C

8 An inflated rubber balloon contains one mole of an ideal gas has a pressure p volume Vand temperature T If the temperature rises to 1 1 T and the volume is increaset to 1 05 V the final pressure will be a 1 1 p b p c less than p d between p and 1 1

Four identical mirrors are made to stand vertically to form a square arrangement as shown in top view A ray starts from the midpoint M of mirror AD and after two reflections reaches corn D Then angle 0 must be A B C D tan 0 75 cot 0 75 sin 0 75 cos 0 75

The length of a cylinder is measured with a meter rod having least count 0 1 cm Its diameter is measured with vernier calipers having least count 0 01 cm Given that length is 5 0 cm and radius is 2 0 cm The percentage error in the calculated value of the volume will be 1 2 201

A solid sphere of radius R 0 2 m and of negligible mass is swimming in the water tank of base surface area A 0 5 m The depth of the water in the tank is h 1 m Determine the work in joules needed to push the sphere down the bottom of tank Assume that no water flows out of the tank The density of water is p 1000 kg m and g 9 81 m s Your Answer Unattempted Rate this questic

The mean time period of second s pendulum is 2 00s and mean absolute error in the time period is 0 05s To express maximum estimate of error the time period should be written as 2 00 0 01 s 2 00 0 025 s 2 00 0 05 s CORRECT ANSWER

In the figure shown strings and pulleys are ideal What is the acceleration of block A and block B if system is released from rest take g 10 m s 2kg A 0 4 A a 28 m s C a 4m s B 3kg B a 2m s D ag 14 1m s

4 A B 3 AB 2 B2 The diagonals of a parallelogram represented by vectors p si 4j 3k i 3i 2 k Then the area of parallelogram is 1 171 unit 2 72 unit 4 72 unit 3 171 unit As shown in figure ABCDEF is a regu

A point charge q exerts an electric force on a second point charge q If third charge q3 is brought 93 near the electric force of q exerted on 92 1 Decreases 2 Increases 3 Remains unchanged 4 Increases if q3 is of same sign as q and 93 pocos if a is of opposite sign

The terminals of battery of emf 12 V and internal resistance 1 Q are connected to a circular coil of resistance 16 Q at two points distance a quarter of circumference of coil The current flowing in smaller arc of circle is 2 4 A 2 25 A X 0 75 A

3 A body A of mass m 0 1 kg has an initial velocity of 31 ms It collides elastically with another body B of the same mass which has an initial velocity of 5jms After collision A moves with a velocity v 4 i j The energy of B after collision is written as 10 The value of x is

35 ADI A N N B 3N C 0 5N D 1 5N A and B are two vectors What is the component of A B on X axis B 60P 30 A A cos30 B cos60 B A cos30 B sin60 C A sin 30 B cos60 D A sin30 B sin60 X 35 A C A 12 A B C C

2 Two vectors and are at an angle of 60 with each other Their resultant makes an angle of 45 with a If b 2 units then is A 3 C 3 1 B 3 1 D 3 2 32 Gatal ada a 45 b 2 44 4 A 3 C 3 1 60 you and i B 3 1 D 3 2

of 45 with a If b 2 units then is A 3 C 3 1 If P Q A 0 B 3 1 D 3 2 PQ then angle between P and Q is B 180 C 90 D 45 33 b 244 A 3 C 3 1 PQPQP A 0 B 180 B 3 1 D 3 2 Q C 90 yal D 45

B A 5i 9j k C 3k D si 21 4k If a vector p make angles a B and y respectively with the X Y Z axis then sin a sin sin y A 1 B 2 C 3 D 0 If and are non collinear unit vectors and 27 B D si 2 4k A si 9j k C 3k asa P X Y Z Bandy you ou ci sin a sin B sin y you A I B 2 C 3 D 0

Q No 24 According to well accepted practice slip gauges which have been handled for a few minutes should be left for sometime The reason for this could be A The moisture transferred from hand would evaporate B The structure of gauges if disturbed would stabilize C Gauges attain the room temperature again D with continuous use gauges may wear quickly

PodS 22 The direction cosines of a vector i j 2k are 1 1 2 1 11 3 5 57 2 4 1 1 1 2 2 2 1 1 1 R 22 1 1 2k alal aucus cosine real 1 1 1 2 2 2 3 1 1 1 1 1 2 1 1

Four resistances of 1502 1202 402 and 1002 respectively in cyclic order to form Wheatstone s network The resistance that is to be connected in parallel with the resistance of 1002 to balance the network is Q

21 ADI two original forces is A 0 B 60 C 90 D 120 Find the component of 7 in the direction of a r a a A B 7 f A 0 21 afar A B C D r a a F f B 60 C 90 lui us D 120 3 3

Q No 27 The vernier reading should not be taken at its face value before an actual check has been taken for A Zero error B Its calibration C Flatness of measuring jaws D Temperature equalization

C 0 3 D 0 6 The angle subtended by the vector A 41 31 12k with the x axis is A sin C cos 13 B sin D cos What is the angle between vector and the 17 A 41 31 12k f ye A sin C cos 1 B sin D cos 1

Q No 11 The advantage of vernier calpier over micrometer is that it A Is easier and quicker to use B Is more accurate C Can be used to make both inside and outside measurements over a range of sizes D All of the above

8 If and are non collinear unit vectors and if a b 3 then the value of 2 56 3 6 is 11 A B CD 9 The angle between the z axis and the vector 41 41 C 3 D 0 28 as 24 24 2 6 3 412 2a 56 3 6 ent 41 A B C 0 41 2

5 There are two vectors A 2 k and B 1 2 2k then vector component of A along Bis A 21 2j 2k 2 2 D None of these hould b Which 25 C 26 A 2i j k B i 23 2k A 26 di Bai 21 21 2k 9 A C 23 2 D