Physics Questions

But I have a doubt why can t it be option b If it isn t correct then please give an exampl e of a scalar which can take ve values 4 h e lowong rements is true la scala quantity s that is conserved in process e scara partir is het entire tea that can never t 1 Ascala quantity het e to another does not very from one point

A particle starts moving at t 0 in x y plane such that its coordinates in m relate with time in sec as x 2t and y 5 sin 2t aximum speed of the particle is O 12 m s 29 m s 2 26 m s

Displacement of a particle is given as x A e kt sin Bt C which of the following is are correct B k is dimensionless B k may be a meaningful term Dimension of A CI A k is LT 2

Question No 4 A block of mass 10 kg is at rest on rough inclined of inclination 37 with help of a constant force F Force F have magnitude 20 N At t 0 another force F2 start acting on block Magnitude of force F2 changes with time as F 10t N Both forces F and F2 are parallel to inclined and are acting up the inclined Friction force acting on block is f Match the list I and List II Coefficient of friction between block and inclined is 0 5 List l List ll t 4 sec t 7 sec III t 10 sec IV t 15 sec 1 P f 0 Q f 30 N R f 40 N S f 60 N T f 80 N 10kg 37 F 20N F 10t Save Ne

A quantum particle is in a state which is the superposition of the eigenstates of the momentum operator Px ih If the probability of finding the momentum k of the particle is 90 compute its wave x function

What should be the maximum angle of acceptance at the air core interface of an optical fibre if n and n are the refractive indices of the core an the cladding respectively sin 1 12 3 tan 2 2 1 sin 2 sin n n 4 sin n 12

For given figure ma is 30 kg mg mc 5 kg respectively All contact surfaces are smooth g 10 m s2 Select the correct statemen B A Acceleration of block A B and C arc 1 m s 4 m s and 5 m s2 respectively Contact force between B Ground is 350 N Tension in string is 30N Contact force between B and C is 20 N

Five charges of equal magnitude placed at corners of a regular pentagon of side a The force on qo which is placed at centroid O is Q 1 S zero E Qo 2kQq A 9 Question Type Single Correct Type O D B Q

Block A of mass 1 kg is kept on block B of mass 2 kg which is kept on smooth surface as shown in figure At t 0 both blocks are at rest a force of 6N is applied on block B Friction coefficient between A B is 0 5 Which of the following is are correct A 0 5 Acceleration of both the blocks is 2 m s Work done by friction in ground frame on A is zero from t 0 to t 2 sec Friction force on A is 2N B Kinetic energy of A at t 2 sec is 8J View In Engleh

A source of emf V sin ot is connected in series with an inductor L capacitor C and resistor R Calculate the impedance and resonant frequency of the circuit Also write an application of the resonant

Two masses m 1kg and m 2 kg are connected by a light inextensible string and suspended by means of a weightless pulley as shown in the figure m 2kg Assuming that both the masses start from rest the distance travelled by m in 2 s is take g 10m s 20 1kg m 20 40

7 A small air bubble is present exactly at the cent of a glass sphere Size of the image as seen fr outside is of 1 Same size 2 Bigger 3 Smaller 4 May be smaller or bigger depending

A block of mass m is at rest w r t disc and disc is rotating with angular velocity w and having angular acceleration a then which of the following is correct a O In inertial frame net force on the block is equal to friction force O Normal on block increases with time O Friction force will be towards centre Friction force on the block is not constant JJ

3 11200 N 4 9600 N A block is placed on the top of a smooth inclined plane of inclination kept on the floor of a lift When the lift is descending with a retardation a the block is released The acceleration of the block relative to the incline is 2 a sin 0 4 g a sin 0 1 g sin 0 3 g a sin 0

A particle of mass m and velocity collides oblique elastically with a stationary particle of mass m The angle between the velocity vectors of the two particles after the collision is in degree

Figure shows a bob moving in horizontal circular motion at angular speed 21 find value of N Strings are of equal lengths and inextensible T tension in supporting strings T is given by 3 2g where AB h The ratio of

A particle in the ground state of an infinitely deep one dimensional pot a perturbation of the form TIX V V cos a where is a constant Find the shift in energy of the particle in the lowest order perturbation theory

Two masses M and M are attached to the e of a string which passes over a pulley attached the top of an inclined plane The angle of inclination of the plane is 30 and M 10 kg M 5 kg What is the accelerati of mass M Inclined plane pulley both are smooth 1 10 m s 3 Zero M Fixed 10 30 M ele 2 5 m s 4 Date insufficient

surfaces A small air bubble is at the centre of a glass sphere of radii 5 cm When it is viewed from outside what will be the position of image Refractive index of glass is 1 5 1 At the same place as that of object 2 10 cm cm from the surface near the eye 3 18 3 7 5 cm from the surface of sphere near the eye

go for NEET 46 A block slides down an inclined plane of inclination O with constant velocity It is then projected up the inclined plane with an initial speed u How far up the incline will it move before coming to rest 1 s 4g sino 3 2 u gaine

ALLEN CAREER INSTITUTE HOTA CAMASTHAND TARGET PRE MEDI Three equal weights A B and C of mass 2kg are hanging on a string passing over a fixed pu which is frictionless as shown in figure The tension in the string connecting weight B and g 9 8m s nearly 1 Zero to A B 2 13 N

Two identical bulbs are connected as shown in figure across a cell of emf E and internal resistance r The brightness of B when bulb B gets fused will T B 8 a Increases b Decreases c Remains constant d Becomes zero

A string of negligible mass going over a clamped pulley of mass m supports a block of mass M as shown in the figure The force on the pulley by the clamp is given by 2001 2M a 2 Mg c g M m m m M b 2 mg d g M m M

A A horizontal overhead powerline is at height of 4 m from the ground and carries a current of 100 A from east to west The magnetic field directly below it on ground is consider wire to remain straight 2 5x 107T northwards 2 5x 107T southwards 5x10 6 T northwards

2 A current is flowing through a conductor which is in the shape of truncated cone If V and V be the drift speed at section 1 and section b then a V V c V V b V V d Any of these

4 Change will depend upon velocity A body of mass 2 kg is hung on a Spring baland mounted vertically in a lift moves up with acceleration equal to the acceleration due to gravity the reading on the spring balance will be 1 2 kg 2 2 g kg 3 4xg kg 4 4 kg

monkey is descending from the branch of ith a constant acceleration If the breaking rength of the branch is 75 of the weight onkey the minimum acceleration with whi onkey can slide down without breaking the anch is g g 2 2 3g 4 4 g 4

A 50 kg boy stands on a platform spring scale in a lift that is going down with a constant speed 3 m s If the lift is brought to rest by a constant deceleration in a distance of 9 m what does the scale read during this period Take g 9 8 m s 1 500 N 3 515 N 2 465 N 4 Zero 800

1 Sheila is trying to write an equation for the equivalent resistance for the following circuit She comes up 1 Rtotal R1 with the following equation Is she correct If not what mistakes did she make and what is the correct equation R R www R R R

ALLEN ARGER INST TARGET PRE MEDICAL 2 A ball of mass 1 kg hangs in equilibrium from a two strings OA and OB as shown in figure What are the tensions in strings OA and OB respectively Take g 10m s A30 1 SN SN 60 90 120150 T W 10 N 2 5 5 N 5 3 N

WEET NURTURE PHASE I TO III INTERNAL TEST 05 02 09 2020 The pendulum hanging from the ceiling of a railway carriage makes an angle 30 with the vertical when it is accelerating The acceleration of the carriage is 1 SI L O

onsider an elevator moving downwards w celeration a the force exerted by a passe mass m on the floor of the elevator is ma 2 ma mg 3 mg ma 4 mg ma wo masses M and M are attached to th

A conducting loop carrying a current I is placed in a uniform magnetic field as shown The loop will have a tendency to y Contract BO 1 2 Expand 3 Move toward ve x axis 4 Move toward ve x axis X

Initially system is in equilibrium If the spring between A B is cut then just after cutting Assume all springs are massless and identical Acceleration of block A is 2g upwards Acceleration of block A is 4g upwards Acceleration of block B is 4g 3 downwards Acceleration of block B is 4g downwards 000000000000 A 2m B3m m

A 3 6 m long 9 0 g string is fixed at both ends and tightened until the wave speed is 80 m s a What is the frequency of the standing wave shown in the figure b What is the wavelength c What is the tension in the string 9301a sabie

A light string going over a clamped pulley m supports a block of mass M as shown in t The force on the pulley by the clamp is gi 1 2 Mg 2 2 mg 3 g M m m 4 g M m M m M

SN 5 3 N 4 5 3 N SN mass is hanging on a spring balance which is ot in a lift at rest shows some reading If the lift ends with increasing speed at constant rate e spring balance will show in its reading Increased Decreased No change Change will depend upon velocity body of mass 2 kg is hung on a Spring balance

A 40 N block supported by two ropes One rope is horizontal and the other makes an angle of 30 with the ceiling The tension in the rope attached to the ceiling is approximately g 10m s 1 80 N 3 40 3 N 4 kg 30 2 40 N 40 4 3 N

horizontally in a vertical plane by two light strings PA and QB as shown in the figure G is the centre of gravity of the rod If PA and QB make angles 30 and 60 respectively with the vertical the ratio IPA TOB 130 is A G W B

If resultant of two vectors A and B is perpendicular B If A 4 3 B 6 then 75 Angle between A and B is radian Magnitude of resultant is 2 3 B A B 0 Angle between A B and is acute angle A

with time as 0 X is unknown circuit element then the maximum reading of the voltmeter V is V 20sinwt and V 20 cos Options O 20 2 V O 10 3 V 020 V voltmeters vary X A X cot T 6

A uniform rod of mass 12 kg and length 4 m is hung from two string of equal length from a ceiling as shown in fig Determine the tension T in N in the string take g 10 m s T 30 4 0 4

An elevator and its load have a total mass of 800 kg If the elevator originally moving downward at 10 m s is brought to rest with constant deceleration in a distance of 25 m the tension in the supporting cable will be Take g 10m s 1 8000 N 3 11200 N 2 6400 N 4 9600 N

As the atmospheric pressure decreases A The spring become more compressed B The spring become less compressed The spring will be elongated D There won t be any change in the elongation of spring 1 20

If resultant of two vectors A and B is perpendicular to g If 4 3 B 6 then 0 7 Angle between A and B is radian Magnitude of resultant is 2 3 B A B Angle between A B and A is acute angle 0

A glass 2 cube of edge length 5 cm placed on horizontal surface has a point source of light S placed at centre of face What should be minimum area to be covered on side faces so that no direct light comes out of the side faces 1 50 cm 3 100 cm S 2 39 25 cm or 4 80 cm S

A ball is projected along the principal axis with speed 10 2 m s at an angle of 45 with the principal axis of a concave mirror If the ball is at 10 m beyond the centre of curvature at the time of projection then relative speed of the image with respect to the object when it crosses the centre of curvature will be 10 2 m s 45 10 m C F P f 15 cm X

1 BALL BOUNCE A pingpong ball dropped from a height of 10 feet Each time it hits the ground it bounces to 80 of its previous height ft 8 0 ounce S TI IL number 4 096 ft 4 096 ft a Find the total distance traveled by the pingpong ball E

An aeroplane flies round a square field PQRS of each side 1000 km Its speed along PQ is 400 km h along QR 500 km h along RS 600 km h and along SP 700 km h The average speed of the aeroplane over the entire trip A 550 km h C 527 km h B 600 km h D 500 km h

INSTRUCTIONS For questions 22 through 27 please refer to the following circul R1 www 2 5kQ Vs 50V 60Hz C1 1 F Solve for the total current in the circuit Select one O a 13 71 mA O b 9 7 mA O c 18 8 mA O d 20 mA Oe None of the above