Physics Questions

Charge through a cross section of a conductor is given by Q 3 2 C where tis time in second The average current through the conductor in the interval t 1 s to t 3 s will be O 6 A O 8 A O 16 A O 12 A

less intense 10 Interference was observed in interference chamber where air was present now the chamber is evacuated and if the same light is used a careful observer will see 1993 CERT a no interference b interference with brighter bands c interference with dark bands d interference fringe with larger width

2 The electric field on two sides of a thin sheet of charge is shown in the figure The charge density on the sheet is On E 8V m E 12V m

What is the change in Gibb s free energy during isothermal expansion of 1 mole of ideal gas from a pressure of 10 atm to a pressure of 1 atm at a temperature of 25 C Select one a 2980 cal b 250 cal c 686 3 cal d 10 cal

View in English A parallel plate air capacitor is charged to a potential difference V After disconnecting from battery the plates of capacitor is pushed gent by an insulating handle to decrease the separation between them As a result the charge on the plate O Decreases O Increases Becomes zero Remains same

Single Correct Option 1 Two very large thin conducting plates having same cross sectio shown in figure They are carrying charges Q and 3Q respectively The variation of electric field as a function at x for x 0 to x 3d will be best represented by 3Q as X

13 A current carrying power line carries current fro east to west The direction of magnetic field short distance vertically below it is 1 North to South 2 South to North 4 West to East 3 East to West

09 The input link O P of a four bar linkage rotated at 2 rad s counter clockwise directic as shown below The angular velocity the coupler PQ in rad s at an instant whe 200 P 180 is 0 a 4 c 1 O GATE 07 PQ 0 Q 2a O P 0 0 a b 2 2 0 1 2

19 If 0 and 0 be the apparent angles of dip observed in two vertical planes at right angles to each other then the true angle of dip 0 is given by 1 tan 0 tan 0 tan 0 2 cot 0 cot 0 cot 0 3 tan 0 tan 0 tan 02 4 cot 0 cot 0 cot 0 ma nics

Match the columns Column A 1 Length 2 10 C to 110 C 3 Mass 4 Time 5 Measuring human body temperature Column B a Pendulum b Tonne c Clinical thermometer d Laboratory thermometer e Screw gauge

View in A wire of resistance xohm is drawn out so that its length is increased to three times its original length and its new resistance becomes 36 Q then x will b 080 060 O 40 20

In the given circuit the potential difference between point A and B is 18 V and charge on 2 F capacitor is 24 C The energy stored in capacitor Cis 2 F 6 F AH 72 J O 144 J O 36 J Data insufficient B

The bob of a 0 2 m long pendulum describes an arc of circle in a vertical plan f the tension in cord is 3 times the weight of the bob when cord makes an angle of 30 to the vertical then acceleration of bob in that position is O g 2 O 3g 2 Read More g 4

The ammeter A reads 4 A and the voltmeter Vreads 40 V The value of resistance Ris Assuming finite value of resistance of ammeter and voltmeter R Exactly 10 ohm O Less than 10 ohm O More than 10 ohm View Information insufficient

A uniform circular disc placed on a rough horizontal surface has initially a velocity v and an angular velocity as shown in the figure The disc comes to rest after moving some distance in the direction of motion Then Vo is rwo el 3 3 Q M 4 2 Vo AC f vozax

The moment of inertia of a triangle of base b and height h about the centroidal axis parallel to its base is Select one O a 1 36 bh Ob 1 3 b h Oc 1 12 bh C O d 1 3 h4

13 A capacitor of capacity Cis charged to a potential difference V and another capacitor of capacity 2C is charged to a potential difference 4 V The charging batteries are disconnected and the two capacitors are connected with reverse polarity i e positive plate of first capacitor is connected to negative plate of second capacitor The heat produced during the redistribution of charge between the capacitors will be 125 CV2 50 CV 3 3 a b c 2CV d 25 CV2 3

A body of mass 10 kg is kept on horizontal floor of coefficient of static friction s 0 5 and coefficient of kinetic friction k 0 45 as shown The contact force on the body when applied force is 40 N is g 9 8 m s 10 F 125 N 106 N Read More 98 N

93 How many redox equivalents will be removed from PGAL and transferred to a molecule of NAD if two molecules of glucose enter the glycolysis 1 2 3 8 2 4 4 6 Jupplysis Substrat

Q8 Assume that a neutron breaks into a proton and an electron The energy released during this process is Mass of neutron 1 6725 x 10 27 kg Mass of proton 1 6725 x 10 27 kg Mass of electron 9 10 1 kg

In Young s double slit experiment carried out with light of wavelength 2 5000 the distance between the slits is 0 2 mm and the screen is at 200 cm from the slits The central maximum is at x 0 The third maximum taking the central maximum as zeroth maximum will be at x equal to a 1 67 cm b 1 5 cm 1992 c 05cm d 50 cm

8 In Young s double slit experiment the slits are 2 mm apart and are illuminated by photons of two wavelengths A 12000A and 10000A At d what minimum distance from the common central bright fringe on the screen 2 m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other a 6mm c 3mm NEET 2013 4mm b d 8mm c

c polarization d photoelectric effect A paper with two marks having separation d is held normal to the line of sight of an observer at a distance of 50m The diameter of the eye lens of the observer is 2 mm Which of the following is the least value of d so that the marks can be seen as separate The mean wavelength of visible light may be taken as 5000 2002 a 1 25m c 1 25 cm b 12 5 cm d 2 5 mm

Electrostatic field in a region is given by E yzi zx xyk V m where x y and z are in m If electric potential at origin is zero then potential at 1m 1m 1m is 1 1 V 3 3 V 2 1 V 4 3 V

In a circuit shown in figure the heat produced in 50 resistor due to current flowing in it is 20 J The heat produced in 60 resistor is 402 www 12 J OBJ 602 www www 592

The linear density of a thin rod of length 1 m varies as 1 2x kg m where is distance from its one end placed at origin What is distance of centre of mass from this end 07 m 12 LO 60 05m Read More E

148 In a double slit experiment the two slits are 1 mm apart and the screen is placed 1 m away A monochromatic light wavelength 500 nm is used What will be the width of each slit for obtaining ten maxima of double slit within the central maxima of single slit pattern 2015 a 0 1 mm b 0 5 mm of c 0 02 mm d 0 2 mm

View in Engilah Ten cell each of emf E and same internal resistance rare connected in series If due to oversight one cell is connected wrongly then the equivalent e m f of the combination is O 12 E O 10 E O BE O BE

2 In Young s double slit experiment the separation d between the slits is 2 mm the wavelength of the light used is 5896 and distance D between the screen and slits is 100 cm It is found that the angular width of the fringes is 0 20 To increase the fringe angular width to 0 21 with same and D the separation between the slits needs to be changed to 1 1 8mm R 2 17mm f 2 1 9mm

This section contains 35 SINGLE CORREC TYPE questions Each question has 4 Read More A block of mass 16 kg is released from top of a smooth inclined plane as show n figure The block comes to rest after compressing the spring by 1 m If spring constant of the spring is 200 N m what is distance travelled by block before coming to rest g 10 m s M 6 m 2 5 m 5 m Immy 30

47 In the Young s double slit experiment the intensity of light at a point on the screen where the path difference is is K 2 being the wave length of light used The intensity at a point where the path difference is 2 4 will be 2014 a K c K 2 b K 4 d Zero

O An auditorium has reverberation time of 2 second The total absorption area in the hall is 4980 m 2 the coefficient of absorption is 0 15 What is volume of the hall 9000 m 3 900 m 3 9000 cm 3 9000000 cm 3

14 The ele a distance from the centre d 24n Eor c 6a Ep 15 Two identical coaxial rings each of radius R are separated by a distance of 3R They are uniformly charged with charges Qand Q respectively The minimum kinetic energy with which a charged particle charge q should be projected from the centre of the negatively charged ring along the axis of the rings such that it reaches the centre of the positively charged ring is a 6a Epr Qq ARE R Qg b d Qq 2TE R 3Qq 4 R

In a van de Graaff generator the radius of sphere is 2 m The maximum potential of the sphere can be given Em 3 x 106 V m 3 x 106 V 6 x 106 V 8 x 106 V

When a small uncharged conducting ball of radius a 1 cm and mass m 50 gm is dropped from a height h above the centre of another large conducting sphere of radius b 1 m having charge Q 100 C it rises to a height h 2m after the collision Find the value of h in m Assume that during the impact there is no dissipation of energy OE m QB h

1 A parallel beam of monochromatic light of wavelength 5000A is incident normally on a single narrow slit of width 0 001 mm The light is focussed by a convex lens on a screen placed in focal plane The first minimum will be formed for the angle of diffraction equal to a 0 b 15 1993 c 30 d 50

17 Young s double slit experment is first performed in air and then in a medium other than air It is found that 8th bright fringe in the medium lies where 5th dark fringe lies in air The refractive index of the medium is nearly 1 1 59 2 1 69 3 1 78 4 1 25 A beam of light from a source L is incident ve is 18

6 The periodic waves of intensities I and 1 pas through a region at the same time in the sam direction The sum of the maximum and minimun intensities is les 2008 2 b 1 a 1 1 11 c IT I d 2 1 1

52 In a diffraction pattern due to a single slit of width a the first minimum is observed at an angle 30 when light of wavelength 5000 is incident on the slit The first secondary maximum is observed at an angle of 2016 a c sin 4 1 sin b sin d sin 2 3 3 4

a 0 4 Six charges are placed at the vertices of a regular hexagon as shown in the figure The electric field on the line passing through point O and perpendicular to the plane of the figure a function of distance x from is x a Q 2Qa EX Q Q b d Q Qa Ex 3Qa 73

A vertical dam on a large lake is 30 ft tall and 60 ft wide and the water level is 3 ft below the top of the dam In the middle of the dam at the very bottom is a gate in the shape of an isosceles triangle 10 ft on a side as shown in the figure below Assume a density of water p 62 4 lb ft3 27 ft 10 ft Find the hydrostatic force in lb on the gate Round your answer to the nearest integer A vertical dam on a large lake is 30 ft tall and 60ft wide and the water level is 3 ft below the top of the dam In the middle of the dam at the very bottom is a gate in the shape of an isosceles triangle 10 ft on a side as shown in the figure below Assume a density of water 62 4 1 10 ft 27 11 Find the hydrostatic force in on the gate Round your answer to the nearest integer 296700

View in English In a meter bridge the balancing length from the left end standard resistance of two ohm is in the right gap is found to be 40 cm The value of unknown resistance is O 40 O 47 C 3 O 20

View in English Three identical bulbs are connected as shown in figure When switch S is open the power consumed in the bulb A is P what is the power consumed by the same bulb when switch S is closed A vo O 9P 4 B

The assembly shown in the figure is composed of two mass less rods of length I with two particles each of mass m The natural frequency of this assembly for small oscillations is GATE 2001 a g l c g cosa a 1 b 2g lcosa d gcosa l CE ENGINEERI

51 Two slits in Young s experiment have widths in the ratio 1 25 The ratio of intensity at the maxima Imax is and minima in the interference pattern min 2015 RS a c 121 49 419 b d 49 121 014 9 15 NCER

2 In a Fresnel biprism experiment the two positions of lens give separation between the slits as 16 cm and 9 cm respectively What is the actual distance of separation 1996 a 12 5 cm c 13 cm b 12 cm d 14 cm

A capacitor of capacitance 2 F is charged to a potential difference of 5 V Now the charging battery is disconnected and the capacitor is connected in parallel to a resistor of 5 2 and another unknown resistor of resistance Ras shown in figure If the total heat produced in 52 resistance is 10 ul then the unknown resistance R is equal to a 10 22 b 15 Q 10 c 2 3 d 7 5 2uF

Q 5 The battery in the diagram is to be charged by the generator G The generator has a terminal voltage of 120 volts when the charging current is 10 amperes The battery has an emf of 100 volts and an internal resistance of 1 ohm In order to charge the battery at 10 amperes charging current the resistance R should be set at A 0 192 B 0 502 C 1 0 2 D 5 0 2 O A OB O c www AF 100 V 12

The Young s double slit experiment is performed with blue and with green light of wavelengths 4360 and 5460A respectively Ifx is the distance of 4th maxima from the central one then 1990 a x blue x green b x blue x green c x blue x green d x blue green 5460 1360

Q 12 By error a student places moving coil voltmeter V nearly ideal in series with the resistance in a circuit in order to read the current as shown The voltmeter reading will be A 0 O A OB O c C B 4V C 6V E 12V r 202 492 D 12V V