RRB NTPC CBT 1 December-7-2022 Exam Previous Question Paper with Solutions

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RRB NTPC

41) If P713 is divisible by 11, find the value of the smallest natural number P?

A) 5
B) 6
C) 7
D) 9

View Answer
D) 9

Explanation:9713 is divisible by 11

42) A car travels at the speed of 50 km/hr for the first half of the journey and at the speed of 60 km/hr for the second half of the journey. What is the average speed of the car for the entire journey?

A) 54.54 km/hr
B) 36.36 km/hr
C) 50.5 km/hr
D) 45.45 km/hr

View Answer
A) 54.54 km/hr

Explanation:Let the total distance = 2D
\frac D{50}+\frac D{60}=Total\;time
Average speed =\frac{2D}{{\displaystyle\frac D{50}}+{\displaystyle\frac D{60}}}=\frac{2x50x60}{110}
=\frac{600}{11}=54.54km/hr

43) The colour of solid lodine is–

A) White
B) Colorless
C) Purplish Grey to Black
D) Reddish Brown

View Answer
C) Purplish Grey to Black

Explanation:The halogens darken in colour as the group is descended:fluorine is a very pale yellow gas, chlorine is greenish-yellow, and bromine is a reddish-brown volatile liquid. Iodine conforms to the
prevailing trend, being a shiny black crystalline solid that melts at 114 °C and boils at 183 °C to form a violet gas

44) A wire when bent in the form of a square encloses an area of 484 sq. cm. If the same wire is bent in the form of a circle, what is the area enclosed by it?

A) 264 sq. cm
B) 616 sq. cm
C) 488 sq. cm
D) 492 sq. cm

View Answer
B) 616 sq. cm

Explanation:area of square = 484 sq cm
Side = 22 cm
Perimeter = 88 cm
2π r = 88
R = 14 cm
Area=πx142
=\frac{22}7x14x14
= 22 × 28 = 616 sq .cm

45) Which among the following is true for the given numbers?

A) \frac{13}{33} < \frac{32}{47} < \frac{20}{47} < \frac{25}{27}
B) \frac{13}{33} < \frac{20}{47} < \frac{25}{27} < \frac{32}{47}
C) \frac{13}{33} < \frac{20}{47} < \frac{32}{47} < \frac{25}{27}
D) \frac{20}{47} < \frac{13}{33} < \frac{32}{47} < \frac{25}{27}

View Answer
C) \frac{13}{33} < \frac{20}{47} < \frac{32}{47} < \frac{25}{27} Explanation:\frac{32}{47} > \frac{20}{47}
\frac{25}{27} > \frac{13}{33},\frac{25}{27} >\frac{32}{47},\frac{25}{27} > \frac{20}{47}
\frac{20}{47} > \frac{13}{33} as 20×33>13×47
combining all the equations we get
\frac{13}{33} < \frac{20}{47} < \frac{32}{47} < \frac{25}{27}

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