Physics-
General
Easy
Question
The average number of prompt neutrons produced per fission of 
is
- More than 5
- 3 to 5
- 2 to 3
- 1 to 2
The correct answer is: 2 to 3
Related Questions to study
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In a nuclear fission reaction
In a nuclear fission reaction
Physics-General
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Figure given below shows two identical parallel plate capacitors connected to a battery with switch 
closed. The switch is now opened and the free space between the plate of capacitors is filled with a dielectric of dielectric constant 3. What will be the ratio of total electrostatic energy stored in both capacitors before and after the introduction of the dielectric
Figure given below shows two identical parallel plate capacitors connected to a battery with switch closed. The switch is now opened and the free space between the plate of capacitors is filled with a dielectric of dielectric constant 3. What will be the ratio of total electrostatic energy stored in both capacitors before and after the introduction of the dielectric
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In the figure below, what is the potential difference between the point A and B and between B and C respectively in steady stat
In the figure below, what is the potential difference between the point A and B and between B and C respectively in steady stat
Physics-General
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An infinite number of identical capacitors each of capacitance 
are connected as in adjoining figure. Then the equivalent capacitance between 
and 
is
An infinite number of identical capacitors each of capacitance are connected as in adjoining figure. Then the equivalent capacitance between and is
Physics-General
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Five identical plates each of area A are joined as shown in the figure. The distance between the plates is d. The plates are connected to a potential difference of 
. The charge on plates 1 and 4 will be
Five identical plates each of area A are joined as shown in the figure. The distance between the plates is d. The plates are connected to a potential difference of . The charge on plates 1 and 4 will be
Physics-General
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A charged particle q is shot towards another charged particle Q which is fixed, with a speed 
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, the closest distances of approach would be
A charged particle q is shot towards another charged particle Q which is fixed, with a speed . It approaches Q upto a closest distance r and then returns. If q were given a speed , the closest distances of approach would be
Physics-General
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Six charges, three positive and three negative of equal magnitude are to be placed at the vertices of a regular hexagon such that the electric field at O is double the electric field when only one positive charge of same magnitude is placed at R. Which of the following arrangements of charges is possible for P, Q, R, S, T and U respectively
Six charges, three positive and three negative of equal magnitude are to be placed at the vertices of a regular hexagon such that the electric field at O is double the electric field when only one positive charge of same magnitude is placed at R. Which of the following arrangements of charges is possible for P, Q, R, S, T and U respectively
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Three charges 
and 
are placed as shown in the figure. The x-component of the force on 
is proportional to
Three charges and are placed as shown in the figure. The x-component of the force on is proportional to
Physics-General
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A small sphere carrying a charge ‘q’ is hanging in between two parallel plates by a string of length L. Time period of pendulum is 
. When parallel plates are charged, the time period changes to 
. The ratio 
is equal to
A small sphere carrying a charge ‘q’ is hanging in between two parallel plates by a string of length L. Time period of pendulum is . When parallel plates are charged, the time period changes to . The ratio is equal to
Physics-General
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Consider two points 1 and 2 in a region outside a charged sphere. Two points are not very far away from the sphere. If E and V represent the electric field vector and the electric potential, which of the following is not possible
Consider two points 1 and 2 in a region outside a charged sphere. Two points are not very far away from the sphere. If E and V represent the electric field vector and the electric potential, which of the following is not possible
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In the given figure two tiny conducting balls of identical mass m and identical charge q hang from non-conducting threads of equal length L. Assume that 
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, then for equilibrium x is equal to
In the given figure two tiny conducting balls of identical mass m and identical charge q hang from non-conducting threads of equal length L. Assume that is so small that , then for equilibrium x is equal to
Physics-General
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An ellipsoidal cavity is carved within a perfect conductor. A positive charge 
is placed at the centre of the cavity. The points and are on the cavity surface as shown in the figure. Then
An ellipsoidal cavity is carved within a perfect conductor. A positive charge is placed at the centre of the cavity. The points and are on the cavity surface as shown in the figure. Then
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A positively charged ball hangs from a silk thread. We put a positive test charge 
at a point and measure 
, then it can be predicted that the electric field strength 
A positively charged ball hangs from a silk thread. We put a positive test charge at a point and measure , then it can be predicted that the electric field strength
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Four identical capacitors are connected as shown in diagram. When a battery of 6 V is connected between A and B, the charge stored is found to be 1.5 
. The value of 
is
Four identical capacitors are connected as shown in diagram. When a battery of 6 V is connected between A and B, the charge stored is found to be 1.5 . The value of is
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Effective capacitance between A and B in the figure shown is (all capacitance are in 
)
Effective capacitance between A and B in the figure shown is (all capacitance are in )
Physics-General
