Experiments Questions and Answers

A C the above The electric field intensity in a region is given by E xi yj V m where x y are in meters Then the pattern of line of forces in x y plane is given by B D Electric field at origin is zero

23 A bullet of mass mand velocity is fired onto a stationary block of mass M and sticks to The final velocity would be m m M B M m M C m M m V D m M M V

9 The main scale of a vernier calliper has n divisions cm n divisions of the vernier scale coincide with n 1 divisions of main scale The least count of the vernier calliper is 1 1 n 1 n 1 1 3 2 cm n cm 1 2 cm n 4 n 1 n n 1 C cm n

34 The bulk modulus of a spherical object is B If it is subjected to uniform pressure p the fractional decrease in radius is 1 3 B 3p 3B 2 3p X 4 B

30 In a screw gauge the main scale divisions is 1mm and there are 100 divisions on circular scale What is the least count of the screw gauge 1 1mm 2 0 1mm 3 0 01mm 4 1cm 35 ins

Velocity and acceleration of a particle at some instant are in to onely v 31 4j 2k m s and a 21 1 2k m s a What is the value of dot product of v and a at the given instant b What is the angle between v and a acute obtuse or 90 c At the given instant whether speed of the particle is increasing decreasing or constan

A person decided to walk on an escalator which is moving at constant rate speed When he moves at the rate 1 step sec then he reaches top in 20 steps Next day he goes 2 steps sec and reaches top in 32 steps If speed of escalator is n steps sec Find the value of n

Examine the experimental mole ratio of reactants used in this experiment calculation h In theory this ratio should be exactly 2 1 Furthermore this ratio is not affected by the limiting reactant THEREFORE using AT LEAST THREE complete sentences but more is better explain at least two possible reasons other than human or calculation error why this ratio is not exactly 2 1 based on the experimental data For instance was something lost during the process and if so what Might there have been extra mass gained at some point and if so what could the extra mass be due to Be sure that your explanations make sense for the ratio that actually was obtained 3

Which of the following sets cannot enter into the list of fundamental quantities in any system of units a length mass and velocity b length time and velocity c mass time and velocity d length time and mass noncured and the result is L T c m d 4 A d a c 5 A

ple 8 If 0 04 M Na SO solutions at 300 K is found to be isotonic with 0 05 M NaCl 100 disscociation solutions calculate degree of disscociation of sodium sulphate

3 If the error in measuring the radius of the sphere is 2 and that in measuring its mass is 3 then the error in measuring the density of material of the sphere is a 5 b 7 c 9 d 11

7 de Broglie wavelength of an electron accelerated by a voltage of 50 V is close to le 1 6x10 19 kg C m 9 1 x 10 31 h 6 6x10 34 0 5 1 2 1 7 2 4 1 2 3 4 Js

If primary winding of a transformer were connected to a battery the current in it will 1 Increase 2 Remain constant 3 Decrease 4 First 1 then 3

A vernier callipers has 20 divisions on the vernier scale which coincide with 19 divisions on the main scale The least count of the instrument is 0 1 mm The main scale divisions are of 2 1 mm 4 1 4 mm 1 0 5 mm 3 2 mm

An atomic clock has an accuracy of 1 part is 10 0 If two such clocks are operated with precision then after running for 2500 years these will record a difference of nearly a 1 sec b 8 sec c 5 sec d 10 sec

of a a Vernier callipers which has divisions of 0 1 cm on its main scale MS and 10 divisions of its vernier scale VS match 9 divisions on the main scale Three such measurements for a ball are given as S No MS cm VS divisions 1 2 3 0 5 0 5 0 5 8 1 0 56 cm 2 0 59 cm 3 0 53 cm 4 0 52 cm 4 6 If the zero error is 0 03 cm then mean corrected diameter is

By sucking through a straw a boy can reduce the pressure in his lungs to 750 mm of Hg density 13 6 g cm Using a straw he can drink water from a maximum depth of 1 13 6 cm 2 1 36 cm 3 0 136 cm 4 10 cm

hoto ectric Effect A photometal is illuminated by lights of wavelengths A and 2 respectively The maximum kinetic energies of electrons emitted in the two cases are E and E respectively The work function of metal is 1 E EX 2 E 2 E h 2 E E 2 2 E E

29 An object is oscillating about certain mean position Its time period of oscillation is being measured by a stop watch of least count 0 1 s For 20 oscillations the time noted down is 40 0 s Then fractional error in measurement of time period oscillation is 1 2 3 1 20 1 400 200 1

c 2 The average kinetic energy of a gas at 23 C and 75 cil pressure is 5x10 14 erg for H The mean kinetic energy of the O at 227 C and 150 cm pressure will be a 80 10 4 erg c 40x10 14 erg b 20 10 4 erg 10x10 14 erg d f hudrogen and oxygen at

F hF dh pgbH 1 3 3 H from the force tom Figure 4 37 shows a cross sectional view of a masonry dam whose length perpendicular to the diagram is 30 m The depth of water behind the dam is 10 m The masonry of which the dam is constructed has a density of 3000 kg m a Find the dimensions x and 2x if the weight of the dam is to be 10 times the horizontal force exerted on it by water b Check the stability of the dam with respect to its overturning about the edge through point O raterr EXY Ram 12m

divisions on the A vernier calipers has 25 vernier scale An object is held between the external jaws of this instrument If the zeroeth division of the vernier scale is to the left of the 32nd division of the main scale and the 20th division of the vernier scale coincides with a main scale division determine the measurement of the object Take 1 M S D 0 5 mm

22 If the length of simple pendulum is increased by 21 then its time period is 1 Increases by 10 2 Decreases by 10 21 4 Decreases by 21 0

The pitch of a screw gauge is 1 mm with 100 divisions on circular scale In measurement of thickness of a wire there are 3 divisions on linear scale and 25 divisions on circular scale coinciding with reference line If nothing is put between the studs then 20th division on circular scale is coinciding with reference line such that zero of linear scale is visible then thickness of wire is 1 3 05 mm 3 3 25 mm 2 3 30 mm 4 3 0 mm

A man crosses a river of width 400 m flowing at 40 m s in minimum time If velocity of man in still water is 50 m s then the displacement of man while he reaches the opposite bank of the river is 1 80 m 2 8 4 m 3 80 41m 4 10 41m

did not turn Three hundred guests were expected for the party but 1 were of the guests sent a reply expressing their inability to attend the function did not do this When we arrived at the party 4 hosts were present There were two men standing on the stage and 5 testing the mike 6 in chairs 7 of the people of the guests who had arrived early were sitting silenth of the guests were standing in corners talking in whispers we as we did not know 9 present There was nothing else 10 also stood watching 8 2 But 3 could do of the

15 g urea and 20 g NaOH dissolved in water Tota mass of solution is 250 g Mole fraction of NaOH in the mixture 1 0 036 3 0 5 2 0 62 4 0 4

In a potentiometer wire experiment the emf of a battery in the primary circuit is 20V and its internal resistance is 50 There is a resistance box in series with the battery and the potentiometer wire whose resistance can be varied from 1202 to 1702 Resistance of the potentiometer wire is 7502 The mocarel tas following potential differences can be measured using this potentiometer 00 A 5V B 6V C 7V D 8V

3 2j 3k 18 If B C and A B C then angl between vectors A and B would be 1 0 3 90 2 45 4 180

In a vernier callipers N division of vernier coincide with N 1 divisions of main scale in which length of a division is 1 mm The least count of the instrument in cm is a N b N 1 c 1 10N d 1 N 1

1 On the lower right corner of the video you can see an image of a graph called the spectrum of the sound of the car horn The spectrum shows that the car horn is made up of dozens of sounds each represented by a vertical line called a peak on the spectrum Take a close look at the spectrum What is the longest wavelength where the car horn spectrum has a peak Hint If you are having trouble reading the vertical axis you can switch the video to full screen using the button on the lower right of the player m

Passage I Beth solids and liquids typically have the property of expanding when heaind Two expertiments were conducted by chemists to study the expansion of various substances In the first experiment Ove 1 meter wires were hang vertically from the ceiling An electric current was passed through each wire t to hear them from OC to 120 C The length of each wire was measured and recorded in 20 degree increments The results of this study are shown in Figure 1 expansion mm 23929 30 20 15 1 0 0 0 0 5 0 Kay aluminum brass copper nickel iron 20 40 60 RO temperature C Figure I 100 120 of various liquids four different solutions were placed in In the second experiment designed to test the expansion 1 meter tall graduated burets The liquids were heated at the was measured in 5 degree increments The results of this same rate from 20 C to 60 C and the increase in volume experiment are shown in Figure 2 volume expanansion ml 2 5 2 0 1 5 1 0 0 5 8 0 0 20 Key water salt water glycerol ethanol 30 40 temperature C Figure 2 50 5 What was the smallest amount of volume exp measured for a liquid at 60 C in Figure 27 A 0 4 ml B 0 8 ml C 1 0 mL D 2 2 mL

Why are we slowly transitioning into hybrid cars instead of moving directly to all electric vehicles Select all that may apply Time is needed for everyone to install car chargers at home Oil is becoming too expensive so we need to switch to other resources Batteries in electric vehicles limit their driving range Batteries for all electric vehicles are expensive

11 6 t T 4 9 x t T T temperature rise C 4 9 t 80 60 40 20 0 0 1 3 2 heating time min Figure 1 m Key water ased on the above figure the relationship between water temperature rise 7 and heating time t is be epresented by which of the following formulas T 11 6 x t air 4 5

Which of the following null hypotheses sets up a straw man null hypothesis There is no relationship between the number of friends individuals have in high school and the number of friends they have in college There is no relationship between the mean winter temperature in the Arctic tundra and the number of Arctic foxes who are alive e spring There is no relationship between a student s 8th grade math scores and her SAT math scores There is no relationship between the number of calories a cat consumes and its weight

If we run the clock of the universe backwards what does Hubble s Law imply was true of the very early universe Select one O a It was very extremely hot Ob It was much more dense than it is today Oc There was more dark matter in the early universe Od A and B are true O e e A B and C are true

Nat lia is using in her speech when she says In state after state where spending 111 on education went up crime went down deductive reasoning inductive reasoning causal reasoning reasoning by analogy

2 A large swimming pool has a temperature of 60 F at 6 a m in morning The air temperature climbs to 100 F during the day That evening will the swimming pool be at 100 F

Two objects charged with an equal amount of charge interact with each other with a force of 3 62 Newton when separated by a distance of 10 2 cm Determine the magnitude of the charge on each object O 2 05 x 10 6 C O 1 12 x 10 6 C O 3 82 x 10 6 C O 7 23 x 10 6 C O 5 44 x 10 6 C

The top of the lens is covered with a black index card as shown in the diagram below what will happen to the image of the pencil Sketch a ray diagram and explain your reasoning Hint How many rays leave each point of the pencil f

Competitive Firm Total Total Output Fixed Costs Q 0 1 2 3 4 5 Variable Costs 100 00 0 00 100 00 70 00 100 00 120 00 100 00 150 00 100 00 200 00 100 00 260 00 Total Costs O 52 00 72 00 O 52 00 75 00 100 00 170 00 220 00 250 00 300 00 360 00 Refer to Table Cost EX2 At 5 units of output average variable cost AVC and average total cost ATC and respectively

What is the pH of a neutral aqueous solution 7 How many times as acidic is a solution of pH 3 than one of pH 57

NS V 5m s a g 10m s 10 t 1 5 3 A car is moving at a constant speed of 54 km h along a straight path It applies brakes and stops after traveling a distance of 22 5 m How much is the stopping time Mor

In Stephen s speech he says Just imagine your mental and physical satisfaction when you reach your exercise goals Which of Maslow s needs is appealed to in this example Self actualization Survival Security

Identify some sources of experimental uncertainty that may have contributed to the difference between your predicted and measured slopes

INTERACTIVITY Perform a virtual experiment to compare the masses and colors of reactants and products Mass Conserved Figure 4 Iron and sulfur react to form iron sulfide The masses of the reactants and the products are shown on the first set of scales The second set of scales shows the masses of two liquid reactants Fill in the expected mass of the liquid products for this second reaction Law of Conservation of Mass When reactants form new products the new products always have the same amount of matter as the reactants During a chemical reaction matter is neither created nor destroyed This is the law of conservation of mass All atoms that are pres ent at the beginning of a chemical reaction are present at the end of the reaction Even though products may have different properties and may look and behave very differently from the reactants the total mass does not change This is why coeffi cients are used to balance equations For example in the reaction such as the one that produces iron sulfide the sum of the masses of iron and sulfur equals the mass of the iron sulfide they produce Figure 4 An atom of iron bonds with an atom of sulfur and the masses of the individual atoms combine when they form molecules If there is more iron than can bind with sulfur or more sulfur than can bind with iron the leftover reactant will still be present as will its mass NO 80 5 Fe S FeS 80 328 220 READING CHECK Integrate With Visuals Explain how the masses on the scales in Figure 4 demonstrate the law of conservation of mass

Which statement best describes how the black spectrum of the car horn when it is stationary compares to the red spectrum of the car horn when it is approaching the recording equipment? When the car is approaching the recording equipment, the red spectrum is shifted to the right compared to when the car horn is stationary. When the car is approaching the recording equipment, the red spectrum is not shifted compared to when the car horn is stationary. When the car is approaching the recording equipment, the red spectrum is shifted to the left compared to when the car horn is stationary.

Calculate: A year is the time it takes a planet to complete one orbit. Use your data to estimate the Year length for each planet. Use time units of Earth years or Earth months. Why does it take the outer planets so long to orbit the Sun? Try to come up with 2 reasons.

A rock is ejected from a volcano with a velocity of 35 m/s at an angle of 45 degrees with the horizontal. The rock strikes the side of the volcano 30.0 m lower than it started from. Neglect the air resistance. a. Calculate the time it takes the rock to follow this path. b. How far from the base of the volcano will the rock strike the ground?

Which of the following is NOT taught to children in anger management programs? How to control inappropriate behavior How to eliminate anger How to recognize emotions that trigger anger How to evaluate emotional situations accurately