MCQ
Fusion reactions take place at high temperature because:
  • A
    Atoms are ionised at high temperature.
  • B
    Molecules break up at high temperature.
  • C
    Nuclei break up at high temperature.
  • D
    Kinetic enrgy is high enough to overcome repulsion between nuclei.

Answer

  1. Kinetic enrgy is high enough to overcome repulsion between nuclei.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

The diagram shows the path of four a-particles of the same energy being scattered by the nucleus of an atom simultaneously. Which of these are/is not physically possible

(a) 3 and 4

(b) 2 and 3

(c) 1 and 4

(d) 4 only

The value of excitation energy required to bring an electron to the first excited state in hydrogen atom is :

If   and  are the number of electrons and holes in a semiconductor heavily doped with phosphorus, then

(a)  

(b)  

(c) 

(d)  

According to the figure, a conducting wire AB (length $l)$ is moving with a velocity v on two parallel rails P and Q. A uniform magnetic field is applied normally inwards to the plane of rails. Essential force needed to keep the velocity of the bar constant is:
Image

Consider four circuits shown in the figure below. In which circuit power dissipated is greatest  (Neglect the internal resistance of the power supply)

(a)

(b)

(c)

(d)

The time taken by a photoelectron to come Out after the photon strikes is approximately.

Putting a dielectric substance between two plates of condenser, capacity, potential and potential energy respectively

(a) Increase, decrease, decrease

(b) Decrease, increase, increase

(c) Increase, increase, increase

(d) Decrease, decrease, decrease

A LC circuit is in the state of resonance. If C = 0.1μF and L = 0.25 henry. Neglecting ohmic resistance of circuit what is the frequency of oscillations

(a) 1007 Hz

(b) 100 Hz

(c) 109 Hz

(d) 500 Hz

Which of the following graphs shows the variation of thermoelectric power with temperature difference between hot and cold junction in thermocouples

(a)

(b)

(c)

(d)

Carbon, silicon and Germanium atoms have four valence electrons each. Their valence and conduction band are separated by energy band gaps represented by (Eg)C. (Eg)Si and (Eg)Ge respectively. Which one of the following relationship is true in their case

(a) ( 

(b)  

(c) 

(d)