All questions of CTET Practice Test (Mathematics Paper 2) for CTET & State TET Exam

Walking from home at 2/3rd of his usual speed, a man reaches his office 30 minutes late. Had the person walked at 5/4th of his usual speed, find the time taken by the man to reach his office. 
  • a)
    45 minutes
  • b)
    50 minutes 
  • c)
    48 minutes
  • d)
    60 minutes 
Correct answer is option 'C'. Can you explain this answer?

Rashi Ahuja answered
If distance is constant then time taken in inversely proportional to the speed. When speed becomes two-third of the normal speed, time taken will be 3/2 times of his normal time. If the normal time to reach the office is T, then the man is taking T/2 time extra to reach the office. 
 
If the man walk at 5/4 th of the normal speed, time taken will be 4/5 th of the normal time 
 

The measure of the four successive angles of a quadrilateral are in the ratio 7 : 11 : 7 : 11. The quadrilateral is a ______. 
  • a)
    trapezium 
  • b)
    rectangle 
  • c)
    parallelogram 
  • d)
    square 
Correct answer is option 'C'. Can you explain this answer?

Shounak Iyer answered
Explanation:

Ratio of angles:
- The given ratio of the four successive angles of the quadrilateral is 7 : 11 : 7 : 11.

Sum of angles in a quadrilateral:
- In any quadrilateral, the sum of all four angles is always 360 degrees.

Calculating angle measurements:
- Let the angles be 7x, 11x, 7x, and 11x (in order) based on the given ratio.
- According to the ratio, the sum of the angles can be expressed as 7x + 11x + 7x + 11x = 360.
- Solving the equation, we get x = 15.
- Therefore, the angles are 105°, 165°, 105°, and 165°.

Identifying the quadrilateral:
- A quadrilateral with opposite angles being equal and the sum of all angles being 360 degrees is a parallelogram.

Conclusion:
- Hence, based on the ratio of the angles and the properties of a quadrilateral, the given quadrilateral is a parallelogram.

The number obtained by interchanging the digits of a two-digit number is less than the original number by 63. If the sum of the digits of the number is 11, what is the original number? 
  • a)
    29 
  • b)
    92 
  • c)
    74 
  • d)
    Cannot be determined 
Correct answer is option 'B'. Can you explain this answer?

Sparsh Das answered
Explanation:

Given conditions:
1. The number obtained by interchanging the digits of a two-digit number is less than the original number by 63.
2. The sum of the digits of the number is 11.

Let's assume the original two-digit number is represented as AB, where A and B are the digits.

Interchanging the digits:
- The number obtained by interchanging the digits is BA.
- So, the difference between the original number and the number obtained by interchanging the digits is given by:
- (10A + B) - (10B + A) = 63
- 9A - 9B = 63
- A - B = 7

Sum of the digits:
- Given that the sum of the digits of the number is 11.
- A + B = 11
- From the above equation A - B = 7 and A + B = 11, we can solve for A and B.
- Solving, we get A = 9 and B = 2.

Hence, the original two-digit number is 92 (Option B).

In class 3/7 of the students are girls and rest are boys. If 2/9 of the girls and 1/11 of the boys are absent. What part of the total number of students are present? 
  • a)
    197/231 
  • b)
    177/231 
  • c)
    197/242 
  • d)
    177/242 
Correct answer is option 'A'. Can you explain this answer?

Understanding the Problem
To solve the problem, we need to determine the fraction of students present in class after accounting for absentees among both girls and boys.
Step 1: Identify Total Students
- Let the total number of students be represented as 'x'.
- According to the problem, 3/7 of the students are girls, meaning:
- Number of girls = (3/7)x
- Number of boys = x - (3/7)x = (4/7)x
Step 2: Calculate Absent Students
- Absent girls: 2/9 of the girls
- Absent girls = (2/9) * (3/7)x = (6/63)x = (2/21)x
- Absent boys: 1/11 of the boys
- Absent boys = (1/11) * (4/7)x = (4/77)x
Step 3: Calculate Present Students
- Present girls = Total girls - Absent girls
- Present girls = (3/7)x - (2/21)x
- To subtract, convert (3/7) to a common denominator:
- (3/7) = (9/21)
- Present girls = (9/21)x - (2/21)x = (7/21)x = (1/3)x
- Present boys = Total boys - Absent boys
- Present boys = (4/7)x - (4/77)x
- Convert (4/7) to a common denominator:
- (4/7) = (44/77)
- Present boys = (44/77)x - (4/77)x = (40/77)x
Step 4: Total Present Students
- Total present students = Present girls + Present boys
- Total present = (1/3)x + (40/77)x
- Convert to a common denominator (231):
- (1/3) = (77/231) and (40/77) = (120/231)
- Total present = (77/231)x + (120/231)x = (197/231)x
Step 5: Calculate the Fraction of Present Students
- Fraction of total students present = Total present / Total students
- = (197/231)x / x = 197/231
Thus, the final answer is 197/231, confirming that option (a) is correct.

Four Iron metal rods of lengths 78 cm, 104 cm, 117 cm, and 169 cm are to be cut into parts of equal length. Each part must be as long as possible. What is the maximum number of pieces that can be cut? 
  • a)
    27 
  • b)
    36 
  • c)
    43 
  • d)
    400 
Correct answer is option 'B'. Can you explain this answer?

Since each Iron rod must be cut into parts of equal length and 
each part must be as long as possible, so HCF should be 
taken. 
HCF of 78, 104, 117 and 169 = 13. 
No. of parts from 78cm. rod = 78 /13=6 
No. of parts from 104 cm. rod =104/13=8 
No. of parts from 117 cm. rod =117/ 13=9 
No. of parts from 169 cm. rod =169 /13=13 
Maximum no. of pieces = 6 + 8 + 9 + 13 = 36 

A diligent man was engaged on a job for 40 days on the condition that he will get a wage of Rs. 180 for the day he works, but he will have to pay a fine of Rs. 20 for each day of his absence. If he gets Rs. 5200 at the end of the 40 days, then, he was absent for how many days? 
  • a)
    12 days 
  • b)
    10 days 
  • c)
    6 days 
  • d)
    8 days 
Correct answer is option 'B'. Can you explain this answer?

Atharva Shah answered
Given:
- The man was engaged on a job for 40 days.
- He will receive Rs. 180 for each day he works.
- He will have to pay a fine of Rs. 20 for each day of his absence.
- He received a total of Rs. 5200 at the end of the 40 days.

To find:
The number of days the man was absent.

Solution:
Let's assume the number of days the man was absent is 'x'.

The total amount he received for working for 40 days is:
40 * Rs. 180 = Rs. 7200

The total amount he paid as a fine for x days of absence is:
x * Rs. 20 = Rs. 20x

Therefore, the total amount he received after deducting the fine is:
7200 - 20x

According to the given information, he received Rs. 5200, so we can write the equation:
7200 - 20x = 5200

Simplifying the equation:
-20x = 5200 - 7200
-20x = -2000

Dividing both sides of the equation by -20:
x = -2000 / -20
x = 100

Therefore, the man was absent for 100/20 = 5 days.

Answer:
The man was absent for 5 days, which is option C.

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