Questions asked by jasmine k.

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• Four bulbs of 10w,20w,30,and 40w are connected in series which bulb will shine more.which will shine more when connected in parallel??
  
• What happens to resistivity(ρ) when area of cross section of material is doubled and length is halved?
  
• If the speed of rotation of AC generator is made four times of its initial value then what is the percentage increase in induced emf?
  
• A projectile has maximum range of 20 m when projected with velocity v if it is projected at an angle of 15 degrees then what is it's range?(velocity same)
  
• A projectile is projected with speed of 19.6 m/s with angle 30 degrees.what is the verticle component of it's velocity after 1sec of flight?
  
• How many ATP are generated during cycling electron transport of photosynthesis?
  
• A body is released from height equal to the radius of earth the velocity of the object when it strikes the surface is? 1) ✓gr 2) ✓2gr 3) 2✓gr
  
• A man 'p' 80kg runs upstairs in 12 seconds.another man 'q' 60kg runs the same stairs in 11seconds.what is the ratio of power of p to q?
  
• What is the angular displacement by minute's hand of a clock after 5 minutes?
  
• A particle in a circular path has instantaneous angular and linear velocities respectively equal to 30rad/sec and 20rad/sec.what is the magnitude of centripetal acceleration?
  
• Can we call HIV onkovirus?
  
• If two objects are released from a certain height both will reach at the same time.but according to fluid dynamics (terminal velocity) the denser will reach first.does it mean that the concept of terminal velocity is wrong??
  
• Two rain drops each of radius r are falling with terminal velocity vt while in motion they coalesce into one drop what is the terminal velocity of the drop so formed?
  
• If a spring is cut into 9 equal pieces then they r connected in series with the same mass.what will be it's frequency relative to the original frequency?my text book says that the answer is 9f.but Time period of spring does not depend on length.right?
  
• What happens to the frequency of a mass attached to spring when energy becomes 16times?
  
• A sound wave of amplitude 0.2mm has an intensity of 3W/m(squared). what will be the intensity of sound of same frequency having amplitude 0.4mm?
  
• The ratio of speed of sound in nitrogen gas to that of helium gas at 300k is. 1)✓2/7. 2)✓1/7. 3) ✓7 4) ✓6/5?
  
• (2j×3i).k=? My text book says the answer is -6. But how?
  
• How can the angle between A×B and B×A be 180 degrees?
  
• How to calculate power for series and parallel circuits?
  
• If a resister of resistance R is cut 3 equal parts.then what is the resistance of equivalent r when connected in parallel?
  
• A bullet fired into a hard target losses half of it's K.E after 3cm.how much distance will it cover before coming to rest.assuming it constantly experience opposing force?
  
• If two inductors are joined in parallel their equivalent inductance is 2.4 if joined in series then equivalent inductance is 10 what is their difference?
  
• On ground the gravitational force on satalite is W what is the gravitational force when the satellite is at the height of R/50 (R is radius of Earth)?
  
• Two forces of magnitude 10N and 10N can't produce a resultant of 1) 0N 2) 20N 3)15N 4)none ??
  
• The magnetude of vector product of two vectors is ✓3 times it's scalar product what is the angle b/t them?
  
• The sum of A and B is 5i+j and their difference is 3i-j what is vector A?
  
• What is the angle between two vectors.A=i-j and B=i+k?
  
• How to find time in case of torricelli's theorem (fluids)?
  
• What is the type of dominance in both genotypic and phenotypic ratios remain the same?
  
• 3H2 + N2----≥ NH3. All of the following will lead in this reaction to the production of more NH3 except? Correct answer is a decrease in the volume of the container, but by decreasing volume pressure increase(Boyle's law) so reaction should proceed in f
  
• Do T lymphocytes make plasma cell clones?
  
• A cable breaks if stretched by more than 2mm.it is cut into 2 equal parts.how much either part can be stretched without breaking?
  
• If we take 2.2 grams of CO2; 6.02×10^21 atoms of nitrogen and 0.03 gram atoms of sulfer then what is the molar ratio of C,N and O respectively?
  
• A man throws a ball vertically upward in a compartment of an accelerated train. The ball will fall A. in front of him B. in his hand C. behind him D. beside him?
  
• During which phase of cell cycle the duplication of centrioles occur?
  
• An automobile is traveling at 60km/h can brake to stop at 20m distance if the car is going at 120km/h then what will be the stopping distance?
  
• Group lllB transition metals has how many electrons in d subshell?
  
• Are enzymes tertiary proteins?
  
• How many bones are there in axial skeleton?
  
• At the center of a circular wire of radius 5cm carrying current, magnetic field due to Earth is 0.5×10^-5W/m^2 what should be the current flowing through the wire so it annuls the earth magnetic field?
  
• What happens to the configuration of the alkile halides in the SN2 mechanism?what does it mean "configuration"?
  
• If a steel cable holding a cable car has stress xkpa. If four more cables are attached to the car,what is the stress on each cable?1) x/4. 2)x/5 3)x/3
  
• When the length of simple pendulum is dubuled ; find the ratio of new frequency to old frequency?
  
• 1kg m^2 s^-2 is equal to? a)10^2gm cm^2 s^-2 b) 10^5gm cm^2 s^-2. c) 10^7gm cm^2 s^-2. D)10^9gm cm^2 s^-2
  
• A photon of wavelength 100mm acts as a mass of? My text book gives the answer 2.21×10^-41. but a photon can't have mass because when an object travels with speed of light it's mass becomes infinite.
  
• If a projectile is projected with kinetic energy.having maximum possible horizontal range.then what will be it's kinetic energy at highest point?
  
• A 100g object is falling freely under gravity in absence of friction what will be the net force on it after 2 seconds?
  
• A proton with velocity v completes a circle with radius r in uniform magnetic field.what should be the velocity of alpha particle so that it completes a circle with same radius under the influence of the same magnetic field?
  
• A particle moves in a circle of radius 25cm covering 2 revolutions per second what will be the radial acceleration of that particle?
  
• Light and heavy objects have equal kinetic energy.which one has greater momentum?
  
• Work done is zero if an object moves with constant velocity? right?
  
• A force 6i+3j+k displaces an object from A(0,3,2) to B(5,1,6) what is the work done?
  
• A bullet hits a solid target lying on a frictionless surface and gets embeded in it.what is conserved(kinetic energy, momentum,both or none)?
  
• Electron,proton, neutron and alpha particle have same momentum which particle has more kinetic energy?