Basic Physics Questions and Answers

n number of waves are produced on a string in 0 5 second Now the tension in a string is doubled Keeping radius constant The number of waves produced in 0 5 second for the same harmonic will be n A 2 B C n 2 n

When a load of 10 N is hanged from a wire the elongation produced is x mm If the wire goes over a pulley and two weights 10 N each are hung at the two ends the elongation of the wire will be in mm 1 Zero 2 2x 3 X 4 X 0

A particle moves on x axis according to the equation x xo sin wt the motion is simple harmonic 1 2 Correct Answer 4 our Answor 1 with amplitude xo with amplitude 2x0 with time period 2m w with time period m w

To increase the current sensitivity of moving coil galvanometer we should decrease number of turns in coil decrease area of cross section of the coil increase torsional constant of spiral springs None of the above

What volume of air measured at 0 C and 1 is needed to burn completely 1 L of butane gas C4H10 measured under the same conditions Assume air has 20 oxygen 1 16 5 L 3 32 5 L 2 3 25 L 4 1 65 L

answer Rain is falling vertically with a velocity of 3 kmh A man walks in the rain with a velocity of 4 kmh The rain drops will fall on the man with a velocity of 1 5 kmh 1 3 3 kmh 1 2 4 kmh 1 4 1 kmh 1

If a particle is moving on a curved path with constant speed then O Velocity remains constant O Body is said to be under acceleration O Body remains unaccelerated Body is moving with decreasing velocity

The following graph shows two isotherms for a fixed mass of an ideal gas The ratio of r m s speed of the molecules at temperatures T and T is H 1 2 2 3 P 2 2 10 Pa N 21 1 I I 2 V m Question Type Single Correct Type 3 4 T

A boy runs on a circular path of radius 14m with a constant speed 4 m s Another boy starts from center of the path to catch the first boy The second boy always remains on the radius connecting the center of circle and the first boy Speed of second boy remains constant 4m s Find the time after which second boy catches first boy Take 22 7

A potentiometer wire 10 m long has a resistance of 40 Q It is connected in series with a resistance box and a 2 V storage cell If the potential gradient along the wire is 0 1 mV cm then resistance unpluggen in the box is A B C 260 Q 760 Q 960 Q

1 A distant telephone whose resistance is 300 ohm is connected to the exchange 10 miles away by a pair of telephone wires whose resistance singly is 5 ohm per mile A twig falls across the wires at a certain point producing the effect of a resistance R connected between the wires at that point Measurements made at the exchange show a resistance between the terminals of the line of 130 ohm which rises to 160 ohm when the distant telephone is disconnected How far from the exchange is the fault to be found and what is the value of

A 150W solar PV panel produces 15V and 7A when it is connected to a load under solar insolation of 700W m 2 If the panel area is 1 5m answer the following question Use the following formula P AxI Pourt IxV n Pour P a Calculate the input power to the solar panel in Watt b What is the output power in Watt c What is the efficiency at this moment d If the system is giving the full output what is the efficiency W W

Q11 A person rubs a neutral comb through their hair and the comb becomes negatively charged Which of the following is the best explanation for this phenomenon O A The hair gains protons from the comb O B The hair gains protons from the comb while giving electrons to the comb O C The hair loses electrons to the comb D The comb loses protons to the person s hand while also gaining electrons from the hair

5 If a b and c then determine p and q are any three non coplanar vectors then prove that points ha mb m c 14 h a m b m c l a m b n c l a m b nac are coplanar if m m m ma 1 0 m M 13 1 1

Six PV modules are connected in series to a load Each module has Voc 48 V and Isc 3 2 A what is the total Voc and Isc O Voc 240 V Isc 3 2A Voc 48 V Isc 3 2 A Voc 48 V Isc 16 A Voc 288 V Isc 3 2 A

2 Zero 4 20 0 2 1 0 0 0 1 3 0 0 0 4 The diameter of a wire is measured to be 0 0205 x 10 m The number of significant figures in measurement is 1 Five 3 Three 2 Four 4 Nine

A positively charged particle moving due east enters a regi on of magnetic field directed upwards This particle will Ans move in circular path with uniform speed So won t an electric force act on it

Let En 2 212 8 n h be the energy of the nth level of H atom If all the H atoms are in the ground state and radiation of frequency E E h falls on it then a it will not be absorbed at all b some of atoms will move to the first excited state c all atoms will be excited to the n 2 state d all atoms will make a transition to the n 3 state

O Consider aiming a beam of free electrons towards free protons When they scatter an electron and a proton cannot combine to produce a H atom because of a energy conservation b simultaneously releasing energy in the from of radiation gh C explain th c momentum conservation nomentum conservation

on 49 When an electron falls from a higher energy to a lower energy level the difference in the energies appears in the form of Madia a electromagnetic radiation only b thermal radiation only EM W only c both electromagnetic and thermal radiations d none of these 55

1 An ionised H molecule consists of an electron and two protons The protons are separated by a small distance of the order of angstrom In the ground state a the electron would not move in circular orbits b the energy would be 2 4 times that of a H atom c the molecule will soon decay in to a proton and a H atom d none of these

Three products are being considered as possible thermal The thicknesses insulators conductivities of the three products are as follows Product I Product II Product III Conductivity arbitrary units arbitrary units 12 6 Thickness 2 and For a given cross sectional area which product would make the best thermal insulator Product I 2 Product II 3 Product III they would all give the same insulation

Q6 The coordinate time graph of an object is a straight line with a positive slope The object has O A Steadily increasing acceleration O B Steadily increasing velocity O c Constant acceleration O D Constant velocity

A mild steel wire of length 2L and cross sectional area A is stretched within elastic limit horizontally between two pillars as shown in the figure A mass m is suspended from the mid point of the wire Strain in the wire is

Q10 The expression Ex Sml becomes dimensionally correct if and only if where E Kinetic energy h plank s constant m mass of an object L length A h should be replaced by h B m should be replaced by m C h should be replaced by h D should be replaced by L

The first diffraction minima due to a single slit diffraction is at 8 30 for a light of wavelength 5000 A The width of the slit is Question Type Single Correct Type 1 5 x 105 cm 2 1 0 x 104 cm 3 2 5x 105 cm English Review Q 4 1 25 x 105 cm

Q2 In a given process of an ideal gas dW 0 and dQ 0 Then for the gas O A The temperature will decrease O B The temperature will increase O C The pressure will remain constant O D The volume will increase

A man wishes to cross a river of width 120 m by a motorboat His rowing speed in still water is 5 m s He takes t seconds to cross the river and reach to the point directly opposite to his starting point Speed of water is 3 m s Find t

Activity 3 Ohm s Law at Home Directions Read and understand the situation below Write your answers on a separate sheet of paper In the Philippines an electric energy distributor supplies each household 220 volts of voltage and 60 A of current Applying your knowledge on Ohm s Law in what way your appliances be used at home to maintain a safe amount o current 2 points 1 point Rubric for Scoring The answer is consistent with the concept of Ohm s Law The answer is not consistent with concept of Ohm s Law

Can it be fixed 15 minutes ago of A bullet is fired from a gun The bullet travels a distance L 235 0 5 m during a time interval t 0 5 0 04 The speed of the bullet in m s can be calculated using the formula Speed L t Calculate the a Speed of the bullet in m s b Fractional uncertainty in the speed c Absolute uncertainty in m s in the speed 9

A 2 volt battery a 15 Q2 resistor and a potentiometer of 100 cm length all are connected in series If the resistance of potentiometer wire is 5 02 then the potential gradient of the potentiometer wire is O 0 005 V cm O 0 05 V cm O 0 02 V cm O 0 2 V cm Marks 4 1

cm 3 4 cm 2 5 cm 4 1 5 cm A ray of light is incident at angle of 60 on a 3cm thick plate u 3 The shift in the path of the ray as it emerges out from the plate is in cm 1 1 3 0 5 2 1 2 4 1 8

Two strings of linear mass densities u and 9u are stretched under same tension A wave travelling on the lighter string towards the heavier string gets partially reflected and transmitted at the junction Then fraction of incident wave energy getting transmitted to the heavier string is 1 11 3 4 9

2 52 Find the node voltages in the circuit in Figur P2 52 1 kn V 6V Download Attachments 2 kn V 12V V3 2 kn 2 mA FIGURE P2 52 1 kn VA 1 kn

3 32 4 34 What is the number of images of an object formed by two mirrors if the angle between the mirrors is in between 2n 4 and 2n 5 1 10 3 6 2 8 4 4

A small block of mass m is allowed to slide from h 2r on an inclined frictionless track in vertical plane from rest position as shown in the figure Find total acceleration of block at point Ci B

A piece of marble is projected from earth s surface with velocity of 25 m s 2 seconds later it just clears a wall 5 m high What is the angle of projection in degree Backspace

Heater of an electric kettle is made of a wire of length L and diameter d It takes 9 minutes to raise the temperature of 0 5 kg water by 50 k this heater is replaced by a new heater having two wires of same material each of length L Diameter of two wires are 2d and 2d If the two wires are connected in parallel how much time in minutes will it take to raise the temperature of 0 5 kg by 50 k

spring balance is attached to the ceiling of a lift A man hangs his bag on the spring and the spring reads 49 N when the lift is stationary If the lift moves downward with an acceleration of 5 mis the reading of the spring alance in N will be g 9 8 m s 1

le 14 Find the magnetic field at the centre of the circular loop shown in figure Dmy m V on Magnetic field at the point O due to infinite wire is Mol 2 R Magnetic field at the point O due to circulaf loop is Moi 2R fold M out of the plane V into the plane M M 1 Moi 1

Two identical containers kept at the same temperature carry the same gas with different molecular mean free paths 11 and 12 the gas from the first container is completely transferred in to the second container at the same temperature What is the molecular resultant mean free path in the second container

Performance of PLC decreases with A Increase in Temperature B Decrease in Temperature C Increase in Vibration D Decrease in Vibration Both A and C Only B Only A Both A and B Solve the following Ladder Diagram Q

Random Access Memory is a type of volatile memory in which data is lost as it is powered off then speed of volatile memory is Faster than non volatile memory Slower than non volatile memory Equal to non volatile memory None of these

following circuit D are ideal diodes then the value of and are respectively 10 V 2kQ w 1 Zero Zero 3 5 mA Zero D 12 kn ww 7 D 2 5 mA 5 mA 4 Zero 5 mA

01 02 03 04 05 06 07 08 09 10 English Review Q A body of mass M and moving with velocity u makes a head on elastic collision with another stationary body of m If A m M then the ratio f of the loss of energy of M to its initial energy will be Question Type Single Correct Type 1 f A A 1 2 3 A 1 UA A 1 4A A 1

Question which formula should we apply for such kind of questions Please explain the solution for following Questi on and even tell what is limit of resolution and concepts r elated to that topic Thank you Have a great day ahead A person standing at a distance of 3 6 km can just resolve two pole The distance between the poles is if eye limit of resolution rad 1 3600 1 m 10 m 0 4 m 5m

A A rigid body is rolling without slipping on the horizontal surface B C D 1 2 3 4 Column 1 Velocity at point A i e VA Velocity at point B i e VB Velocity at point Ci e Vc Velocity at point D i e VD ANI4 2 1 2 B 813 3 3 C5 4 4 2 4 1 2 Column II 3 D3 2 1 1 v 2 4 2v English Zero Q Revie Question Type Single Correct Type

38 A conical container of radius R 1m and height H 5m is filled completely with liquid There a hole at the bottom of container of area x x 10 m see figure Time taken to empty the conica 42 container in sec is t then fill 40 in OMR sheet Take g 10 m s H 4

exptar why optio 6 For measurement of potential difference potentiometer is preferred in comparison to voltmeter because a potentiometer is more sensitive than voltmeter b the resistance of potentiometer is less than voltmeter c is cheaper than voltmeter potentiometer d potentiometer does not take current from the circuit

A particle moves in the east direction with 15 m see for 2 sec then northwards with 5 m s for 8 sec Average speed of the particle is 01 m s O 5 m s 07 m s O 10 m s Marks 4