Check Your Concepts

Q-01) Which of the following statement is true for distance and linear displacement When a body is in motion.
a) distance travelled =linear displacement
b) distance travelled always increases with time.
c) linear displacement always increases with time
d) all the above.

Q-02) body is travelling in a straight line without change in direction then which of the following statement is true
a) distance travelled always increase with time.
b) linear displacement is equal to distance travelled.
c) if length of the line is L then linear displacement is equal to L.
d) none

Q-03) which of the following statement is true for Speed and linear velocity
a) speed is a scalar quantity.
b) linear velocity is a scalar quantity.
c) speed can be equal to linear velocity
d) none

Q-04) Height of Tower is H. Body is thrown upwards from the top of Tower with linear velocity U.
a) when the body reaches bottom just before touching the ground it's speed is equal to zero
b) just before touching the ground it's speed is √2 u +2gh
c) just before touching the ground it's linear velocity is equal to zero
d) None

Q-05) Height of Tower is H. Body a is thrown upwards with linear velocity U and another body b is thrown downwards with linear velocity U.
a) ratio of speed of two bodies is one.
b) Ontouching ground the linear velocity of two bodies is zero.
c) ratio of linear velocity is -1 on touching ground.
d) none of the above.
Good Luck.... Try to Answer it....
From : Er.DHIREN

-------------------------- IIT JEE Mains Test Paper --------------------------
Q1) height of Tower is H. Body is thrown upwards will linear velocity U from the top of the tower another body is thrown horizontally from the top of the tower. Which of the following statement is true
a) ratio of speed how was the bodies just before touching ground is one.
b) ratio of linear velocity about the body is one.
C) the linear velocity of the second bodies √u×u+ 2gh.
d) none of the above.
Q2) block of mass M he is kept on a table had a force is applied horizontally the block does not moves.
a) static frictional force is equal to applied force.
b) static frictional force is equal to zero.
c) normal reaction for is equal to weight
d) none of the above.
Q3) which of the following statements are true
a) linear momentum of a system can be conserved force is applied on the system.
b) in elastic collision energy of system is conserved.
C) in inelastic collision energy of system is conserved.
d) all the above.
Q4) temperature of 20 gram of water is 80 degree centigrade, is to be converted to steam.
a) heat supplied is 11000 CAL.
b) the curve between heat supplied and increasing temperature is a straight line passing through origin.
c) heat supplied is along the axis increase in temperature is along the x-axis the slope of the line is thermal capacity.
d) the all the above.
Q5) which of the following statement is true
a) everybody at all temperature emits heat energy.
b) temperature of body isgreater than temperature of surrounding then also body emits heat energy.
c) temperature of body is greater than temperature of surrounding body does not emit heat energy.
d) none of the above.
Q6) in conduction in study state
a) rate of flow of heat is constant.
b) rate of flow of heat depends on thermal conductivity.
c) loss of heat occurs from the body.
d) both a and b.
Q7) current is flowing in a wire radius of the wire is r it is a hollow wire
a) magnetic field intensity inside the wire is zero.
b) magnetic field intensity is maximum on the surface.
c) outside the wire magnetic field intensity he is inversely proportional to x square, X distance from the axis.
d) all the above
Q8) in a Cell which has EMF E and internal assistance r when current flows
a) terminal potential difference can be greater than EMF of the cell.
b) terminal potential difference can be equal to EMF.
c) terminal potential difference can be less than EMF of cell.
d) all the above.
Q9) chargegiven to solid conducting sphere fully filled
a) charge is on the surface of conducting sphere.
b) electric field intensity inside is zero.
C) the electric potential inside and at the surface is equal.
d) both a and c.
Q10) which of the following statements are true
a) electric field due to a point charge is a conservative field.
b) gravitational field is a conservative field.
c) in conservative field at all the point sum of kinetic and potential energy is a constant.
d) all the above.
Q11) when PN junction is formed
a) the direction of electric field intensity is from N type towards P type.
b) electron diffuses from n type towards P type.
c) Donor ions and accepted ions are in mobile charges electron is a mobile charge.
d) all the above
Q12) which of the following statement is true
a) gravitational field intensity at the centre of earth zero.
b) gravitational field intensity increases linearly from Centre to the surface.
c) outside the earth the shape of the curve between gravitational field intensity and distance from the centre of earth is rectangular hyperbola.
d) all the above.
13) body is moving in circular path with constant speed
a) linear velocity is a constant.
b) angular velocity is a constant.
c) linear momentum is a constant.
d) centripetal force is a constant.
14) positive charge enters perpendicular to uniform magnetic field
a) charge particle moves in a circular path.
b) speed of charge particle is a constant
c) linear momentum of charge particle is a constant
d) all the above
15) which of the following statement Is true
a) N type semiconductor is negatively charged.
b) P type semiconductor is positively charged.
c) in Ntype semiconductor semiconductor the donor level is formed just below the conduction band.
d) all the above.
16) which of the following statement is true
a) lightwavesare electromagnetic waves.
b) heat wave are electromagnetic waves.
c) wavelength of light waves is less than heat waves.
d) all the above.
17) which of the following statement is true.
a) violet to Red wavelength increases.
b) violetto Red linear velocity of light increases.
c) violetto Red focal length of the lens increases.
d) both b and c.
18) which of the following statement is true
a) current density is a vector quantity.
b) EMF is a vector quantity.
c) magnetic field intensity is a vector quantity.
d) both a and c.
19) which statement is true.
a) rectifier converts AC into unit directional AC.
b) in a transistor transfer of resistance occurs.
c) depletion reason in a PN junction consists of Donor and accepter ions.
d) all the above.
20) an object is thrown upwards with linear velocity u from a point on the ground.
a) had the highest point linear velocity is zero.
b) when the body comes back and touches the ground its linear velocity zero.
c) just before touching the ground it's linear velocity is u.
d) none of the above.
21) electrical assistant inductor and capacitor are connected in series to AC source
a) the electrical resistance depends on the frequency of AC source.
b) the curve between Inductive reactance and frequency is a straight line passing through origin.
c) the curve between capacitative reactance and frequency is a rectangular hyperbola.
d) both be and c.
22) which of the following statement is true
a) positive charge enters perpendicular to uniform electric field intensity the path of charge particle is a parabola.
b) positive charge enters perpendicular to uniform magnetic field the path of charge particle is circular.
c) a body is thrown upwards with linear velocity you making an angle theta with the horizontal the path of charge particle is a parabola.
d) all the above.
23) square loop in which current is flowing in clockwise direction is kept perpendicular to uniform magnetic field
a) resultant magnetic force exerted on the square loop is zero.
b) result and torque exerted on the square loop is zero.
c) square loop rotate about an axis passing through plane about the centre
With constant angular velocity r.
d) none of the above.
24) which of the following statement is true
a) Newton's law of cooling the curve between temperature and time is a straight line.
b) in Newton's law of cooling the temperature decreases exponentially.
c) a Newton's law of cooling the temperature decreases parabolically.
d) all the above.
25) which of the following statement is true.
a) electric dipole is kept at angle s degree with uniform electric field intensity the resultant force on electric dipole is zero.
b) electric dipole is kept at an angle S degree with uniform electric field intensity the resultant torque is zero.
c) electric dipole is kept at an angle S degree in uniform electric field intensity
For very small angles the electric the electric dipole does
simple harmonic motion.
d) electric dipole is kept in uniform electric field intensity making an angle S degree with the uniform electric field intensity for large angles the path of electric dipole is simple Harmonic Motion about its stable equilibrium position.
26) in Photoelectric effect explain by EINSTEIN
a) it is based on Wave theory of light.
b) based on Quantum theory of light.
c) when frequency of incident light is equal to or greater than threshold frequency then Photoelectric effect occurs
d) both b and c.
27) in the production of X-rays in coolidge tube
a) the intensity of X-rays depends on temperature of the filament.
b)The energy of X which of the following statement is true rays of depends on the accelerating voltage.
c) The intensityof X-rays depends on the filament current.
d) all the above.
28) height of Tower is H. From the top ball is dropped and another similar ball rules and comes down
a) just before touching the ground the ratio of their kinetic energy is one.
b) ratio of their linear velocity is one.
c) ratio of their speed is one.
d) all the above.
29) which statement is true.
a) the curve between acceleration due to gravity and distance from centre of earth is a straigjtline passing through origin.
b) the curve between acceleration due to gravity and distance from centre of earth is rectangular hyperbola.
c) when a body is on the surface of earth the orbital velocity depends on mass of the body. d) none of the above.
30) in hydrogen like atom.
a) radius of the orbit is directly proportional to square of n and is the number of orbit.
b) energy of the electron is directly proportional to 1 / n square.
c) electrostatic force of attraction of the nucleus on the electron provides the necessary centripetal force.
d) all the above.

Questions based on motion in gravity.
Object is thrown with linear velocity vectoru=u upwards.Path is a straight line then which of the statements are true or false.. assumethat Earth is not moving.
1) the linear velocity of the object that highest point is 0.
2) the linear velocity of the object when it reaches at the same point is same.
3) the speed of the object at the highest point is zero.
4) the ratio of the linear velocity when the object reaches at the same point it is one.
5) linear displacement when the object reaches the same point is zero.
6) height which is less then the maximum height ratio of linear velocity is1.
7) When object touches ground then velocity is 0.
8) time to reach maximum height and come to same point on the ground same.