391. In one second, a ball dropped from a certain height travels 10 meters. After ten seconds, the ball will have traveled the following distance:
A. 100M
B. 490M
C. 300M
D. 200M
392. A ball of mass 0.5 kg is dropped from a height of 78.4 m. The time taken by the ball to hit the ground is:
A. 8 sec
B. 16 sec
C. 2 sec
D. 4 sec
393. The velocity of the projectile at its maximum height is:
A. Zero
B. Minimum
C. Maximum
D. None of them
394. Unstable elementary particles heavier than the proton are called?
(A) K Mesons
B) Hyperons
(C) Leptons
(D) Strange particles
395. Among the following elementary particles, which one never decays in free space?
A) Protons
(B) Hyperons
(C) Neutrons
(D) None of the above
396. The first phase of a nuclear reaction involves the formation of?
A) A compound nucleus
(B) A meson
(C) An Alpha particle
(D) An isotope
397. A nucleus with an excess of neutrons may decay radioactively with the emission of?
(A) A positron
(B) A proton
(C) A neutron
D) An electron
398. The tunnel effect makes possible?
(A) Gamma Decay
B) Alpha Decay
(C) Negative Beta Decay
(D) Positive Beta Decay
399. Yukawa’s theory suggests that nuclear forces arise through the exchange of?
(A) Electrons
(B) Protons
(C) Neutrons
D) Mesons
400. The ionization energy of an atom relative to the binding energy of its nucleus is?
(A) Same
B) Smaller
(C) Greater
(D) Sometimes smaller and sometimes greater
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