AMU BSc PYQ 2026 | AMU BSc Previous Year Question with explanation

61. Two spherical nuclei of radii $R_1$ and $R_2$ have respectively mass numbers 216 and 64. The ratio $R_1/R_2$ is:

(a) 0.75

(b) 1.0

(c) 1.3

(d) 3.375

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62. The potential energy U, of two atoms in a solid separated by a distance x is given by $U=-\frac{A}{x^6}$, where A is a positive constant. The force exerted by one atom on the other is :

(a) $\frac{-2A}{x^6}$

(b) $\frac{-A}{2x^6}$

(c) $\frac{-6A}{x^7}$

(d) $\frac{6A}{x^7}$

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63. If the two inputs of a NAND gate are shorted, the gate will be equivalent to:

(a) OR

(b) XOR

(c) NOR

(d) NOT

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64. The percentage errors in the measurement of mass and speed are 2% and 3%, respectively. How much will be the maximum errors in the estimate of kinetic energy obtained by measuring mass and speed ?

(a) 8%

(b) 7%

(c) 9%

(d) 6%

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65. Let the dimensions of mass, length, time and charge be $M^1$, $L^1$, $T^1$, and $C^1$, respectively. The dimensions of the magnetic induction field $\vec{B}$ in terms of $M^1$ , $L^1$, $T^1$, $C^1$will be :

(a) $M^1 L^0 T^{-1} C^{-1}$

(b) $M^1 L^0 T^{-1} C^{-1}$

(c) $M^2 L^2 T^{-2} C^{-2}$

(d) $M^1 L^0 T^1 C^{-2}$

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