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Sat August 16, 2014

Mistake Or Not Science

http://www.topperlearning.com/study/cbse/class-6/science/video-lessons/living-organisms-and-surroundings/characteristics-of-living-beings/b101c5s5e5ch212t2951   time- 6:35    I found the the plant breathing oxygen in day in that time if thats a mistake its ok if not please explain me.   PS: i know plants breath oxygen in night exception peepal plant.

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Entrance Exam

Sun August 10, 2014

serious illness

my parents want me to become a doctor but i want to do something fun loving int his case studying bio phy and chem hasbecome really difficult for me please help me on how to concentrate and understand it more

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Entrance Exam

Sat August 02, 2014

Best of LUCK!!

 

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Entrance Exam

Fri August 01, 2014

AIEEE & IIT-JEE(MAINS)

Are AIEEE & IIT-JEE(MAINS) the one and the same or different? Can any one help me come out of this confusion please.

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Entrance Exam

Fri August 01, 2014

Chemical Bonding

Which of the following properties describes the diogonal relationship between Boron and Silicon a)BCl3 is not hydrolysed while SiCl4 can be hydrolysed b)Both form oxides; B2O3 is amphoteric;SiO2 is acidic c)Both dissolve in cold and dilute Nitric acid d)Borides and Silicites are hydrolysed by water

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Entrance Exam

Fri August 01, 2014

Chemical Bonding

Which of the following models best describes the bonding within a layer of the graphite stucture? a)mettalic bonding  b)ionic bonding c)non-mettalic covalent bonding d)van der walls' forces

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Entrance Exam

Fri August 01, 2014

Structures

What is the stucture of tetracynomethane,  1,3-buta-di-ene?

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Entrance Exam

Fri July 25, 2014

hii

       

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Entrance Exam

Tue July 08, 2014

pcm

Solar spectrum is an example for (A) line emission spectrum (B) continuous emission spectrum (C) band absorption spectrum (D) line absorption spectrum

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Entrance Exam

Tue July 08, 2014

pcm

Pick out the correct statement from the following : (A) pu239 is not suitable for a fission reaction. (B) For stable nucleus, the specific binding energy is low. (C) Energy released per unit mass of the reactant is less in case of fusion reaction. (D) Packing fraction may be positive or may be negative

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Entrance Exam

Tue July 08, 2014

pcm

Magnetic field at the centre of a circular coil of radius R due to current I flowing through it is B. The magnetic Held at a point along the axis at distance R from the centre is ______. (A)  (B)  (C)  (D)  

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Entrance Exam

Tue July 08, 2014

pcm

Maximum diffraction takes place in a given slit for (A) g- rays (B) ultraviolet light (C) infrared light (D) radio waves

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Entrance Exam

Tue July 08, 2014

pcm

A car is moving with a speed of 30 m/s on a circular path of radius 500 m. Its speed is increasing at the rate of 2 m/s2. The acceleration of the car is (a) 9.8 m/s2 (b) 1.8 m/2 (c) 2 m/s2 (d) 2.7 m/s2

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Entrance Exam

Tue July 08, 2014

pcm

A car is moving on a circular path and takes a turn. If R1 and R2 are the reactions on the inner and outer wheels respectively, then (a) R1 = R2 (b) R1 < R2 (c) R1 > R2 (d) R1  ³ R2

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Entrance Exam

Tue July 08, 2014

pcm

A body of mass m is suspended from a string of length l. What is the minimum horizontal velocity that should be given to the body in its lowest position so that it may complete full revolution in the vertical plane with the point of suspension at the center of circle? (a)  (b)  (c)  (d) 

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Entrance Exam

Tue July 08, 2014

pcm

A body is moving along a circular path with variable speed. It has (a) a radial acceleration (b) a tangential acceleration (c) zero acceleration (d) both tangential and radial accelerations

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Entrance Exam

Tue July 08, 2014

pcm

ln which of the processes, does the internal energy of the system remain constant? (A) Adiabatic (B) Isochoric (C) Isobaric (D) Isothermal

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Entrance Exam

Tue July 08, 2014

pcm

A car is moving in a circular track of radius 10 metre with a constant speed of 10 m/sec. A plumb bob is suspended from the roof of the car by a light rigid rod of 1 metre long. The angle made by the rod with the track is (a) zero (b) 30° (c) 45° (d) 60°

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Entrance Exam

Tue July 08, 2014

pcm

A car has a linear velocity v on a circular track of radius r. If its speed is increasing at a rate of a m/s2, then its resultant acceleration will be (a)  (b)  (c)  (d) 

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Entrance Exam

Tue July 08, 2014

pcm

A can filled with water is revolved in a vertical circle of radius 4 metre and the water does not fall down. The time period of revolution will be (a) 1 sec (b) 10 sec (c) 8 sec (d) 4 sec

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Entrance Exam

Tue July 08, 2014

pcm

A bucket tied at the end of a 1.6 m long string is whirled in a vertical circle with a constant speed. What should be the minimum speed so that the water from the bucket does not spill when the bucket is at the highest position? (a) 4 m/sec. (b) 6.25 m/sec. (c) 16 m/sec. (d) None of these

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Entrance Exam

Tue July 08, 2014

pcm

A bucket containing water is tied to one end of a rope of length 2.5 m and rotated about the other end in a vertical circle. What should be the minimum velocity of the bucket at the highest point, so that the water in the bucket will not spill? (g = 10 m/s2) (a) 2.5 m/s (b) 4 m/s (c) 5 m/s (d) 7 m/s

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Entrance Exam

Tue July 08, 2014

pcm

A body of mass m performing UCM with frequency n along the circumference of circle having radius r, force is given by (a) 4pnm2 (b) 4p2n2m (c) p2n2mr (d) pnm2

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Entrance Exam

Tue July 08, 2014

pcm

A body of mass 100 gram, tied at the end of a string of length 3 m rotates in a vertical circle and is just able to complete the circle. If the tension in the string at its lowest point is 3.7 N, then its angular velocity will be ______ (g = 10 m/s2) (a) 4 rad/s (b) 3 rad/s (c) 2 rad/s (d) 1 rad/s

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Entrance Exam

Tue July 08, 2014

pcm

A body of mass 100 gram, tied at the end of a string of length 3 m rotates in a vertical circle and is just able to complete the circle. If the tension in the string at its lowest point is 3.7 N, then its angular velocity will be ______ (g = 10 m/s2) (a) 4 rad/s (b) 3 rad/s (c) 2 rad/s (d) 1 rad/s

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Entrance Exam
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