The dimension of are :
- Option 1)
- Option 2)
- Option 3)
- Option 4)
Answered Feb 02, 2019
Option 1)
Option 2)
Option 3)
Option 4)
A rod of weight w is supported by two parallel knife edges A and B and is in equilibrium in a horizontal position. The knives are at a distance d from each other. The centre of mass of the rod is at distance x from A. The normal reaction on A is:
- Option 1)
- Option 2)
- Option 3)
- Option 4)
Answered Feb 02, 2019
Option 1)
Option 2)
Option 3)
Option 4)
In a vessel, the gas is at a pressure P. If the mass of all the molecules is halved and their speed is doubled, then the resultant pressure will be:
- Option 1)
4P
- Option 2)
2P
- Option 3)
P
- Option 4)
Answered Feb 02, 2019
Pressure of a gas
if mass is halved and speed is doubled pressure becomes 2P
Option 1)
4P
Option 2)
2P
Option 3)
P
Option 4)
)
A particle p is projected from a point on the surface of a smooth inclined plane (see fig), simultaneously another particle Q isreleased on the smooth inclined plane from the same position. p and Q collide after t=4sec. The speed of projection of P is
Answered Jan 01, 2019
@Arvind gupta
For Q
U=0,
So
Now for P
if the angle of projection of P with the incline surface is α
=> ucosα = speed along the plane, a = gsinθ° = acceleration along the plane
Similarly usinα = speed perpendicular to the plane, a = gcosθ° = acceleration perpendicular to the plane
time of flight (For P) = 2usinα/gcosθ° = 4 s
usinα = 2gcosθ°
distance travelled down incline = s = ut + ½at²
Sp= 4ucosα + 8gsinθ°
So Sp=Sq
= 4ucosα + 8gsinθ° = 8gsinθ°
=> cosα = 0 or α = 90°
So we get u = 2gcosθ°=
Answered Jan 01, 2019
Velocity=14.7 m/s
Time taken by the truck to cover 58.8=t=S/v=58.8/14.7 =4sec
Since ball returns back to truck its angle of projection is vertically upwards with respect to truck.
u=speed of projection.
t=4s
h=0
h=4u-1/2 x 9.8x16
0=4u-78.4
4u=78.4
u=78.4/4=19.6 m/s
b) As seen from the road the speed of
ball will be resultant of 2 speeds vertical
speed =u=19.6 m/s
Horizontal speed given by truck=14.7m/s
⇒√u²+v²=√19.6²+14.7²=24.5 m/s
Thus angle seen from road:
Tan⻹[19.6/14.7]
=Tan⻹1.33
=Tan⻹[4/3]
=53°with horizontal.
Prevalence of pesticide resistant insects
Answered Jan 01, 2019
According to Darwin's concept of natural selection, the organisms which are provided with favourable variations would survive because they are the fittest to face their surrounding while the organisms which are unfit for surrounding variations are destroyed. Prevalence of pesticide resistant insects is due to adaptability of these insects for the changes in environment due to use of pesticides.
Sir/Madam , can you tell me what is the significance of DNA satellite in DNA fingerprinting? Gene in forms of DNA sequence - (Tip): By defining a cistron as a segment of DNA code for a polypeptide, The structural gene in a transcription unit could be said as monocistronic or polycistronic.
Functional unit If inheritance located on the DNA
Gene in forms of DNA sequence
The monocistronic structural gene
Types of RNA
Functions of types of RNA
Process Of Transcription
Working of RNA polymerase
Termination
Transcription In Eukaryotes
Splicing
Cappinq
Tailing
Proposition made by George garow
Salient features of genetics code
Transcription unit
Salient features Of genetics code
phenylalanine
Convention in deferning two strands of the DNA
Convention in deferning two strands of the DNA
The Promoter
The Terminator
t' RNA- the adapter molecule
Initiator t-RNA
Translation
Answered Jan 01, 2019
A DNA satellite is a region that consists of short DNA sequences repeated many times. The variation between individuals in the lengths of their DNA satellites forms the basis of DNA fingerprinting.
DNA satellites are of two types, i.e. microsatellites and minisatellites. Their characteristic that makes them useful for identification is that they are highly polymorphic. The length of each satellite in DNA is inherited.
The length of satellite regions are highly variable between people. These form small peaks during density gradient centrifugation and thus are invaluable for identification purposes.
In the circuit shown, the current in the 1 resistor is :
- Option 1)
1.3 A ,from P to Q
- Option 2)
0 A
- Option 3)
0.13 A ,from Q to P
- Option 4)
0.13 A ,from P to Q
Answered Oct 10, 2018
answer is option 3)0.13A from Q to P
- Let, Current i1 from 6v battery passes through 3 ohm resistance . At Q current breaks and current i2 goes through 3 ohm and ( i1-i2 ) goes through 1 ohm ,.
- Applying, kirchoffs law in 1st and 2nd loop,we get two eqns as follows
- 4i1-i2=6
- 6i2-i1=9
- solving ,, i1-i2 =0.13 A
- Previous
- 1(current)