Which of the following statements about nuclear reaction is correct? The reaction A Involves neutrons onlyB Takes place inside the nucleusC Is governed by temperature and pressureD Involves protons and electrons onlyPrevNext

With reference to the radioactivity, which of the following statements is/are correct ?  1. Radioactivity is a nuclear property.  2. Hydrogen bomb is prepared on the principle of nuclear fission.  Select the correct answer using the codes given below. Codes :   1 point(a) Only 1(b) Only 2(c) Both 1 and 2(d) Neither 1 nor 2

Which of the following statements is CORRECT?A.     DNA material and other cytoplasmic contents double in the prophase stage.B.     Nuclear envelop breaks before the prophase proceeds.a.A onlyb.B onlyc.Both A and Bd.Neither A nor B

Protons and neutrons are tightly packed together in the nucleus. Question 3 options: True False

1. Considering the difference between chemical reactions and nuclear reactions, which of the following statementsis FALSE?A. Chemical reactions release or absorb relatively small quantities of energy while nuclear reactions involvetremendous amounts of energy.B. Chemical reactions involve only electrons while nuclear reactions involve only neutrons and protons.C. Chemical reactions are affected by external factors such as pressure and temperature while nuclearreactions depend on the nature of the nucleus.D. Chemical reactions involve rearrangement of chemical bonds while nuclear reactions involve transformationof elements.2. Which of the following factors can affect the rate of a chemical reaction?A. The concentration of reactants.B. The color of the reaction mixture.C. The volume of the reaction vessel.D. The shape of the reaction container.3. Consider the reaction 2A+B→3C, which follows second-order kinetics. The initial concentrations are [A]₀ = 0.2 Mand [B]₀ = 0.3 M. After a certain time t, the concentration of C is measured to be [C] = 0.15 M. Which of thefollowing statements is correct regarding the concentrations of reactants A and B at time t?A. [A] at time t is less than 0.1 M, and [B] at time t is less than 0.2 M.B. [A] at time t is less than 0.1 M, and [B] at time t is greater than 0.2 M.C. [A] at time t is greater than 0.1 M, and [B] at time t is less than 0.2 M.D. [A] at time t is greater than 0.1 M, and [B] at time t is greater than 0.2 M.4. Study the given graph. Which region in the graph does alpha particle emission most likely occur?5. A reaction involving two reactants A and B has a total order of 2. Which of the following is likely to be the rateconstant for this reaction?A. 0.4278 M min-1B. 1.5134 M-1 s-1C. 0.0005232 yr-1D. 65.1405 M-2 s-16. Which of the following can block gamma radiation?A. shirtB. handC. a general chemistry textbookD. a slab of hollow block7. For the reaction A + B + C→ products, when the concentration of C is tripled, the concentration of B is doubled,and the concentration of A multiplied by a factor of 1/3, the rate increases by a factor of 9. Which of the followingis the correct rate law for the reaction?A. rate = [A][B][C] 3B. rate = [A][B][C]C. rate = [B]2 [C]D. rate = [A][C]38. How many neutrons are produced in the following fission reaction?23994 Pu(n,a)23692 UA. 0B. 1C. 2D. 39. Catalysts are used to speed up chemical reactions. Which of the following statements is TRUE regardingcatalysts?A. Heterogenous catalysts are generally more effective than homogenous catalysts.B. Catalysts do not change the mechanism of a reaction; they lower the activation energy of the reaction.C. The effect of a catalyst does not depend on the temperature at which the reaction is taking place.D. Catalysts are more efficient at higher concentrations of the substrate.10. A patient undergoes a series of radiographic imaging procedures in a hospital. During these procedures, thefollowing radiation doses are absorbed by different organs:• The liver absorbs 50 millisieverts (mSv) of radiation.• The brain absorbs 10 centigrays (cGy) of radiation.• The heart absorbs 100 micrograys (µGy) of radiation.Which of the following statements is correct regarding the absorbed radiation doses in these organs?A. The liver received the highest absorbed dose.B. The brain received the highest absorbed dose.C. The heart received the highest absorbed dose.D. The absorbed doses are equal, so no organ received the highest dose.

This question contains Statement −1 and Statement-2. Of the four choices given after the statements, choose the one that best describes the two statements.Statement - I:Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion. andStatement - IIFor heavy nuclei, binding energy per nucleon increases with increasing Z while for light nuclei it decrease with increasing Z.Statement −1 is false, Statement −2 is true.Statement - 1is true, Statement −2 is true; Statement −2 is correct explanation for Statement-1.Statement −1 is true, Statement −2 is true; Statement −2 is not a correct explanation for Statement-1.Statement −1 is true, Statement −2 is False.