In circular motion, even if the speed remains constant, the direction of motion is constantly changing at every point along the circular path (tangentially).
Q. 102. The unit of power is
(A) watt
(B) joule
(C) newton
(D) kelvin
Answer:
(A) watt
Explanation:
The standard SI unit of power is the watt (W), which measures the rate of energy transfer and is equivalent to one joule per second.
Q. 103. Which of the following involves electromagnetic induction?
(A) charge is put on a rod
(B) an electric current produces a magnetic field
(C) a magnetic field exerts a force on a current carrying wire
(D) relative motion between a magnet and a coil produces an electric current.
Answer:
(D) relative motion between a magnet and a coil produces an electric current.
Explanation:
Electromagnetic induction is the process discovered by Faraday where a changing magnetic field (through relative motion between a magnet and a coil) induces an electromotive force or electric current in the conductor.
Q. 104. The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?
(A) Between the principal focus and centre of curvature
(B) At the centre of the curvature
(C) Beyond the centre of the curvature
(D) Between the pole of the mirror and its principal focus
Answer:
(D) Between the pole of the mirror and its principal focus
Explanation:
A concave mirror typically forms real, inverted images. However, when an object is placed extremely close to the mirror—between its pole (P) and principal focus (F)—it forms a virtual, erect, and magnified image.
Q. 105. The change in focal length of an eye lens is caused by the action of
(A) Retina
(B) pupil
(C) ciliary muscles
(D) iris
Answer:
(C) ciliary muscles
Explanation:
The ciliary muscles control the curvature of the crystalline lens in the human eye, thereby altering its focal length to clearly focus on objects at varying distances (a process called accommodation).
Q. 106. Antibiotic Penicillin was discovered by
(A) Edward Jenner
(B) Alexander Fleming
(C) Robert Koch
(D) Joseph Lister
Answer:
(B) Alexander Fleming
Explanation:
The Scottish bacteriologist Alexander Fleming discovered the first true antibiotic, penicillin, in 1928 after observing the antibacterial properties of the Penicillium mold.
Q. 107. Which of the following is the first word processor application?
(A) MS Word
(B) Apple I work
(C) Word Star
(D) Word Perfect
Answer:
(C) Word Star
Explanation:
Released in 1979, WordStar is widely recognized as the first commercially successful microcomputer word processing software program.
Q. 108. Which of the following is valatile memory in a computer system?
(A) RAM
(B) ROM
(C) Optical Drive
(D) Hard Disk
Answer:
(A) RAM
Explanation:
Random Access Memory (RAM) is a type of volatile memory, meaning it requires continuous power to retain the stored data. Once the computer is turned off, the data is lost.
Q. 109. One Tera Byte = ?
(A) 1028 Megabytes
(B) 1024 Gigabytes
(C) 1024 Kilobytes
(D) 1028 Gigabytes
Answer:
(B) 1024 Gigabytes
Explanation:
In standard digital storage measurement, 1 Terabyte (TB) is equal to 1024 Gigabytes (GB).
Q. 110. Rickets is caused by the deficiency of:
(A) Vitamin A
(B) Vitamin D
(C) Vitamin C
(D) Iodine
Answer:
(B) Vitamin D
Explanation:
Rickets is a childhood bone disorder characterized by the softening and weakening of the bones, which is primarily caused by a prolonged deficiency of Vitamin D (necessary for calcium absorption).
Q. 111. 9501 – ? = 3697 *(Note: Reconstructed from context based on source numeric traces)*
(A) 13198
(B) 5814
(C) 5804
(D) 4894
Answer:
(C) 5804
Explanation:
Solving the equation for the missing number: 9501 – 3697 = 5804.
Q. 112. H.C.F of 42, 63 and 140 is
(A) 14
(B) 9
(C) 21
(D) 7
Answer:
(D) 7
Explanation:
The prime factorizations are: , , and . The Highest Common Factor (HCF) shared among all three numbers is 7.
Q. 113.
(A) 0.036
(B) 0.009
(C) 0.0036
(D) 0.00036
Answer:
(D) 0.00036
Explanation:
Multiplying the non-zero digits gives $9 \times 4 = 36$. Counting the decimal places, there are two in 0.09 and three in 0.004, totaling five decimal places. The correct answer is 0.00036.
Q. 114. 1 litre of water weighs 1 kg. How many cubic millimetres of water will weigh 0.1 gm?
(A) 0.1
(B) 1
(C) 10
(D) 100
Answer:
(D) 100
Explanation:
1 kg (1000 grams) of water is equivalent to 1 Litre, which equals 1,000,000 cubic millimeters (). Thus, 1 gram of water = . Therefore, 0.1 grams = .
Q. 115.
(A) 2.25
(B) 0.225
(C) 2.025
(D) 0.29875
Answer:
(B) 0.225
Explanation:
According to BODMAS, multiply first: , and . Subtracting the two gives 0.25 – 0.025 = 0.225.
Q. 116. In an examination, it is required to get 36% of the maximum marks to pass. A student got 113 marks and was declared failed by 85 marks. What was the maximum mark?
(A) 600
(B) 550
(C) 640
(D) 650
Answer:
(B) 550
Explanation:
The passing marks required equal the student’s score plus the shortfall: $113 + 85 = 198$. Since 198 represents 36% of the maximum marks, the total maximum marks = .
Q. 117. The average age of 30 students in a class is 12 years. The average age of a group of 5 students of the class is 10 years and that of another group of 5 students is 14 years. The average age of remaining students is :
(A) 8 years
(B) 10 years
(C) 12 years
(D) 16 years
Answer:
(C) 12 years
Explanation:
Total age of all 30 students = . Total age of the first group of 5 = . Total age of the second group of 5 = . The sum of these 10 students is 120. The total age of the remaining 20 students = 360 – 120 = 240. Their average = 240 / 20 = 12 years.
Q. 118. If radius of a circle is reduced by 50%, its area is reduced by-
(A) 25%
(B) 50%
(C) 75%
(D) 100%
Answer:
(C) 75%
Explanation:
The area of a circle is proportional to the square of its radius (). If the radius is halved (0.5r), the new area is , which is 25% of the original area. This means the area is reduced by .
Q. 119. In an examination 70% of the candidates passed in English, 80% passed in Mathematics, 10% failed in both subjects. If 144 candidates passed in both, the total number of candidates was:
(A) 125
(B) 200
(C) 240
(D) 375
Answer:
(C) 240
Explanation:
If 10% failed both, then 90% passed in at least one subject. According to set theory, Pass(English or Math) = Pass(English) + Pass(Math) – Pass(Both). So, . Pass(Both) = . If 60% of candidates = 144, then total candidates = $144 / 0.60 = 240.
Q. 120. A man buys 12 articles for 12 rupees and sells it at the rate of 1.25 rupees per article. His gain percentage is:
(A) 20%
(B) 25%
(C) 15%
(D) 18%
Answer:
(B) 25%
Explanation:
Cost Price (CP) for 1 article = Rs. 1. Selling Price (SP) for 1 article = Rs. 1.25. Profit = 1.25 – 1 = 0.25. Gain Percentage = .
Q. 121. If the length of hypotenuse of a right angled triangle is 5 cm and its area is 6 sq. cm, then the length of the remaining sides are
(A) 1 cm, 3 cm
(B) 3 cm, 2 cm
(C) 3 cm, 4 cm
(D) 4 cm, 2 cm
Answer:
(C) 3 cm, 4 cm
Explanation:
By the Pythagorean theorem, sides 3 cm and 4 cm yield a hypotenuse of cm. Furthermore, the area is sq. cm. This perfectly matches the given conditions.
Q. 122. A cone and a cylinder are of the same height. Their radii of the bases are in ratio of 2:1. The ratio of their volumes is:
(A) 2:1
(B) 3:2
(C) 4:3
(D) 1:3
Answer:
(C) 4:3
Explanation:
Volume of a cone = . Volume of a cylinder = . The radii ratio is 2:1, so let and . Cone volume = . Cylinder volume = . The ratio is , which simplifies to 4:3.
Q. 123.
(A) 37
(B) 47
(C) 67
(D) 27
Answer:
(B) 47
Explanation:
Solving for the unknown value: . (You can also confirm this by multiplying the last digits: , meaning the result must end in 9).
Q. 124.
(A) 7077
(B) 70707
(C) 7707
(D) 7007
Answer:
(B) 70707
Explanation:
Performing long division on 777777 by 11 yields 70707. (, drop the next 7, then 0, then 77 again, etc.)
Q. 125. What is the smallest number to be added to 269 to make it perfect square?
(A) 31
(B) 16
(C) 7
(D) 20
Answer:
(D) 20
Explanation:
The nearest perfect square greater than 269 is . The number required to reach 289 from 269 is 289 – 269 = 20.
Q. 126. A gardener wants to plant 17956 trees in such a way that there are as many rows as there are trees in the row. The number of trees in a row is:
(A) 144
(B) 136
(C) 154
(D) 134
Answer:
(D) 134
Explanation:
The arrangement forms a perfect square grid, so the number of trees in a row is the square root of 17956. $\sqrt{17956} = 134$.
Q. 127. What is equivalent discount on a sale of any product with two consecutive discounts of 25% followed by 20%?
(A) 15%
(B) 60%
(C) 40%
(D) 25%
Answer:
(C) 40%
Explanation:
The formula for successive discounts is $X + Y – (XY / 100)$. Therefore: $25 + 20 – (25 \times 20 / 100) = 45 – 5 = 40\%$. Alternatively, a Rs. 100 item drops to Rs. 75, then a 20% discount on Rs. 75 is Rs. 15, making the final price Rs. 60. The total discount is Rs. 40 (40%).
Q. 128. Two whole numbers whose sum is 64 can not be in the ratio
(A) 5:3
(B) 7:1
(C) 3:4
(D) 9:7
Answer:
(C) 3:4
Explanation:
For two whole numbers to sum to 64, the sum of their ratio components must be a divisor of 64. The sums are: 5+3=8, 7+1=8, 9+7=16, all of which divide 64 evenly. However, 3+4=7, and 64 is not divisible by 7 without resulting in fractions.
Q. 129. If 12 men or 18 women can do a work in 14 days, then the number of days that 8 men and 16 women will take to do that work is
(A) 7
(B) 9
(C) 8
(D) 5
Answer:
(B) 9
Explanation:
Since 12 men = 18 women, the efficiency ratio is 2 men = 3 women. Therefore, 8 men is equivalent to 12 women. The new workforce of 8 men and 16 women equals 12 + 16 = 28 women. Using the inverse proportion formula : . Solving gives days.
Q. 130. Three years ago the average age of A and B was 18 years. When C joined them, the average becomes 22 years now. How old is C now?
(A) 24 years
(B) 27 years
(C) 28 years
(D) 30 years
Answer:
(A) 24 years
Explanation:
Three years ago, the sum of ages of A and B was . Their current combined age is 36 + 3 + 3 = 42 years. The present average of A, B, and C is 22, making their combined sum . Thus, C’s current age is 66 – 42 = 24 years.
