InterviewSolution
Saved Bookmarks
InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 3501. |
whena lightraymakesan angle90^(@)ofwhile enteringa glassslabfromair, it |
|
Answer» bandstowards thenormal |
|
| 3502. |
Under what condition is the average velcity equal to instantneous velcity ? |
| Answer» SOLUTION :When the BODY is MOVING with UNIFORM VELOCITY. | |
| 3503. |
What is meant by free fall ? |
|
Answer» Solution :(i) When the PERSON in a lift moves down with an acceleration (a) equal to the acceleration DUE to gravity (g), i.e., when a=g, this motion is called as .free fall.. (ii) The apparent WEIGHT `(R = m (g-g) = 0)` of the person is zero. This condition or STATE refers to the state of weightlessness. |
|
| 3504. |
How is the device measuring electric current connected in the circuit? |
| Answer» SOLUTION : In SERIES | |
| 3505. |
What do you understand by the term 'infrasonic vibration"? |
|
Answer» Solution :Intrasonic WAVES - These are sound waves with a frequency below 20 Hz that cannot be HEARD by the human EAR. E.g., waves produced during EARTH quake, OCEAN waves, sound produced by whales, etc. |
|
| 3506. |
Statethe use of Maxwell.s corckscrew rule . |
| Answer» Solution :Maxwell.s CORKSCREW rulerulethemagneticpolarities of a CURRENT - CARRYING COIL or a SOLENOID . | |
| 3507. |
How does the currentin a domesticcircuit differ from thatused to run a clock ? |
| Answer» Solution :The CURRENTIN a domestic circuit is an alternatingcurrent (AC), whilethe current used to run a clockis a DIRECT current (DC). | |
| 3509. |
A concave mirror forms a virtual, erect and enlarged image when an object is placed between principal focus and centre of curvature of the mirror. |
| Answer» Solution :A concave mirror FORMS a real, INVERTED and ENLARGED image when an object is placed between F and C. | |
| 3510. |
There are two wires. One of them carries a current . How will you findout whichone carries a current ? |
| Answer» SOLUTION :BRING a magneticneedlenear the wire. The current - carryingwire will PRODUCE a deflectionin the NEEDLE whereasethe wirewithout a currentwill not. | |
| 3511. |
An echo repeats two syllables. If the velocity of sound be 330ms^(-1) then the distance of the reflecting surface is |
|
Answer» 16.5 m |
|
| 3512. |
What happen to the weightof a person while he goes from polar region to equator ? |
|
Answer» Solution :(i) The VALUE of G is MAXIMUM in polar region and minimum at the equatorregion . (ii) Sinceweight W=mg , as g VARIES , the weight of the person is more at poles than at the EQUATOR region. |
|
| 3513. |
Weight of a body is greater at the equator and lessat the polarregion . |
| Answer» Solution :Correct STATEMENT : WEIGHT of a body is LESSER at the equator and GREATER at the polar REGION. | |
| 3514. |
The change in the value of 'g' at a height 'h' above the surface of the earth is the same as at a depth 'd' below the surface of earth. When both 'd' and 'h' are much smaller then the radius of earth, then which one of the following is correct? |
|
Answer» `d=(H)/(2)` |
|
| 3515. |
ATP: |
| Answer» Solution :ATP or Adenosine TRI PHOSPHATE acts as an energy, the phosphate BONDS in ATP are broken down and energy is released. | |
| 3516. |
In a food chain,autotrophic plants are present at the "__________________" level. |
|
Answer» TERTIARY nutrition |
|
| 3517. |
Giveanytwoexample for heterodiatomicmolecules . |
| Answer» SOLUTION :Heterodiatomic molecules-E.g: HCL, NACL | |
| 3518. |
Themagneticfieldin a giveregion is unifrom . Draw a diagram to represent it . |
Answer» Solution :A unfirom magneticfieldin a given REGION can berepresented by strainght , parallel EQUALLY SPACED field lines. 
|
|
| 3519. |
What is the reason for refraction? |
|
Answer» |
|
| 3520. |
An electron and a proton, using parallel to each other, enter a uniform magnetic field with same velcoity. The direction of magnetic field and their motion coincides (is same). How will the direction of their paths be affected when they are travelling in (a) same direction (b) opposite direction. Justify your answer. |
| Answer» SOLUTION :A magnetic field does not exert any FORCE on a charge MOVING PARALLEL or antiparallel to the field DIRECTION. Since they are travelling in the direction of the magnetic field, there will be no force acting on them. Hence their paths will remain the same after entering the magnetic field. | |
| 3521. |
Disasters are predictable events which cause damage to environment and human life. |
| Answer» SOLUTION :DISASTERS are SUDDEN and unpredicatable EVENTS which CAUSE damage to environment and human life. | |
| 3522. |
You might have observed that sometimes your pet dog starts barking though no one is seen in its surroundings or no disturbance heard nearby. Does this observation raise any doubts in your mind about the peculiar behaviour of dong after your understanding about 'range' of hearing the sound'. If yes, write them. |
|
Answer» SOLUTION :1) Dogs can hear sounds of frequencies upto about 50 kHz, which is ultrasonic. 2) After HEARING this ultrasonics, a DOG will bark panicly, though no one is seen near. 3) I understood this after studying about 'range of hearing the sound'. 4) Before the knowledge of 'range of hearing the sound'. I felt that the dogs are barking by seenin some devils, which is a misconception. Scientific knowledge helps us to know reasons for many misconcepts. |
|
| 3523. |
How will the magnetic field intensityBat the centreof a circular coilcarryingcurrentchange, If the currentthrough the coil is doubled and the radiusof the coilis halved ? |
| Answer» SOLUTION :The MAGNETIC field at the CENTRE of the coil . `B prop (1)/(R)` . | |
| 3524. |
A concave mirror is dipped in vessel containing kerosene. Will this affect the focal length of the concave mirror ? Justify. |
| Answer» Solution :No. Dipping the CONCAVE MIRROR in kersosene will not change the focal length of the concave mirror. The focal length of a mirror does not depend on the SURROUNDING MEDIUM. | |
| 3525. |
Heat is supplied to a system, but its internal energy does not increase. What is the process involved ? |
| Answer» SOLUTION :ISOTHERMAL EXPANSION. | |
| 3526. |
In the experiment to trace the path of a ray of light through a parallel sided glass slab, a student measured the angles of refraction for three different angles of incidence. He will find that : |
|
Answer» angle of refraction is always equal to the angle of INCIDENCE |
|
| 3527. |
In Activity 13.7 (NCERT Textbook), how do we think the displacement of rod AB will be affected if (i) current in rod AB is increased, (ii) a stronger horse-shoe magnet is used, and (iii) length of the rod AB is increased ? |
|
Answer» Solution :(i) On INCREASING the current in rod AB its displacement will increase. (ii) If we use a STRONGER horse-shoe MAGNET then the displacement of rod AB will increase. (iii) If length of the rod is increased, force ACTING on it will increase and, hence, displacement of the rod increases. |
|
| 3528. |
A wire of resistance R is stretched so that its length increases by 10%. The resistance of the wire increases by |
|
Answer» 0.11 ` or A_1 = (l)/(l_1) a=(100)/(110) A` but`R= RHO (l)/(A)` `thereforeR_1rho(110)/(100)l xx (110)/(100A) =(121)/(100) ( rho (l)/(A))` =21%( increase) |
|
| 3529. |
Which defect of the eye can be corrected using a cylindrical lens ? |
| Answer» SOLUTION :ASTIGMATISM. | |
| 3530. |
Let rho (r ) = (Q r)/(pi R^(4)) be the charge density distribution for a solid sphere of radius R and total charge Q. For a point P inside the sphere at a distance r_(1) from the centre of the sphere, the magnitude of electric field is |
|
Answer» `(Q)/(4pi in_(0) r_(1)^(2))` |
|
| 3531. |
A physical quantity is measured as Q = (2.1 ± 0.5) units. Calculate the percentage error in (1) Q^(2) (2) 2Q. |
|
Answer» Solution :`P=Q^(2)` `(Deltap)/(p)=(2DeltaQ)/(Q)=2((0.5)/(2.1))=(1.0)/(2.1)=0.476` `(Deltap)/(p)xx100%=47.6%=48%` `R=2Q` `(DeltaR)/(R)=(DeltaQ)/(Q)implies(0.5)/(2.1)=0.238` `(DeltaR)/(R)xx100%=24%` |
|
| 3532. |
GSAT |
| Answer» SOLUTION :GEOSYNCHRONOUS SATELLITE. | |
| 3533. |
Define 1 dioptre of power of a lens. |
| Answer» SOLUTION :1 dioptre power is DEFINED as the power of a lens having a FOCAL LENGTH of 1 m. | |
| 3534. |
Which component of linear momentum does not contribute to angular momentum ? |
| Answer» SOLUTION :RADIAL COMPONENT. | |
| 3535. |
The image of an object formed by a device is always virtual and small. The device may be |
|
Answer» GLASS plate |
|
| 3536. |
A nut which can be broken by applying a force of 40 kgf, is broken by using a nut cracker having its handle 20 cm long, by placing it at a distance 2 cm from the hinge. Calculate the minimum force needed to break the nut. |
|
Answer» Solution :Given, load=40 kgf, EFFORT=? load arm=2cm, effort arm=20 CM By the PRINCIPLE of MOMENTS, load`xx`load arm=effort`xx`effort arm `40kgfxx2cm=Exx10cm` `therefore E=(40xx2)/(20)kgf=4kgf`. |
|
| 3537. |
Explain the principle & structure of atom bomb. |
|
Answer» Solution :Atom bomb: (i) The atom bomb is based on the principle of uncontrolled CHAIN reaction. In an uncontrolled chain reaction, the number of neutrons and the number of FISSION reactions multiply almost in a geometrical progression. (ii) This releases a huge amount of energy in very small time interval and leads to an explosion  Structures (i) An atom bomb consists of a piece of fissile material whose mass is subcritical. This piece has a cylindrical void (ii)It has a cylindrical fissile material which can fit into this void and its mass is also sub critical. When the bomb has to be exploded, this cylinder isinjected into the void using a conventional explosive. (iii) The two pieces of fissile material join to form the supercritical mass, which leads to an explosion. During this explosion tremendous amount of energy in the form of HEAT, light and radiation is RELEASED. (iv) region of very high temperature and pressure is formed in a fraction of a second along with the emission of hazardous radiation LIKE `gamma` rays, which adversely affect the living creatures. This type of atom bombs were exploded in 1945 at Hiroshima and Nagasaki in Japan during the World War II |
|
| 3538. |
Whilt is short drcuiting ? State one factor/condition that can lead to it. Name a device in the household that acts as a safety measure for it. State the principle of its working. |
|
Answer» Solution :Situation in which live and neutral wire come in direct CONTACT, abruptly increasing the current in the circuit is called short-circuiting. FACTOR : Insulation fo wire is damaged / fault in appliance. Safety device : electric fuse. Electric fuse is an application of Joule.s heating. If there is a current larger than the specified value the temperature of fuse wire INCREASES and it melts to break the electric circuit and stop the FLOW of unduly high electric current. |
|
| 3539. |
Which special cells are present in the body of sponges (Porifera)? |
|
Answer» Collar CELLS Porifera animals are attached to the substratum. They do not show locomotion . For gathering and catching the food, they NEED to PRODUCE a current in the water . FORTHIS purpose , they have characteristic collar cells in their body. Germ cells and ectodermal cells are seen in all other PHYLA. Cnidoblasts are characteristic features of coelenterates. |
|
| 3542. |
Themagneticfieldat thecentre of a current -carrying circularloop is …….to thecurrentand ……to the loop.s radius . |
|
Answer» INVERSELY PROPORTIONAL, directlyproportional |
|
| 3543. |
Each side of a cube is measured to be 7.203 m . What is (i) the total surface area and (ii)the volume of the cube to appropriate significant figures ? |
|
Answer» |
|
| 3544. |
The power of a motor a is 40 kW .At what speed can the motor raise a load of 20,000 N? |
| Answer» SOLUTION :2 m `s^(-1)` | |
| 3545. |
All isotopes of uranium do not undergo ____________ when they absorbneutron. |
| Answer» SOLUTION :NUCLEAR FISSION | |
| 3547. |
Explain the following Why is tungsten used almost exclusively for filament of electric lamps? |
| Answer» SOLUTION :TUNGSTEN has a high resistivity and a high melting point. So, most of the POWER CONSUMED by it, is clissipated in the FORM of heat. | |
| 3548. |
Chulha/Burner : Thermal energy : : Sewing machine : ……. |
| Answer» SOLUTION :MECHANICAL ENERGY. | |
| 3549. |
Which of the following phenomena of light are involved in the formation of a rainbow? |
|
Answer» Reflection, REFRACTION and DISPERSION |
|
| 3550. |
What do you mean by the term load in an electric circuit? |
| Answer» Solution :ELECTRIC LAMPS, heaters, AIR conditioners, motors and other DEVICES which WORK on electricity are called loads because they consume electric energy. | |