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- Question
- A car is moving with the speed of 47.52km/hr and the radius of the wheel of car is 21 cm. Calculate the approximate number of revolutions made by the wheel in one minute.
Options- A. 250 rpm
- B. 200 rpm
- C. 600 rpm
- D. 300 rpm
- Correct Answer
- 600 rpm
ExplanationSpeed in cm/minute = (Speed in km/hr x 1000 x100 )/60
= 47.52x(50/3)
=79200 cm/min
And Circumference of circle = 2?r
=2 x ( 22 / 7 ) x 21
=132
No. of revolutions = ( Speed in cm/minute ) / circumference of circle in cm
=79200 / 132
=600 rpm - 1. The rational for the recurring decimal 0.125125......is
Options- A. 125/99
- B. 125/999
- C. 125/9999
- D. 125/9 Discuss
- 2. 4.036 divided by 0.04 gives
Options- A. 1.009
- B. 10.09
- C. 100.9
- D. None of these Discuss
- 3. A boat whose speed in still water is 9 kmph, goes 12 km downstream and comes back in 3 hrs. Find the speed of the stream?
Options- A. 1 kmph
- B. 3 kmph
- C. 5 kmph
- D. 4 kmph Discuss
- 4. If today is Saturday, what will be the day 350 days from now ?
Options- A. Saturday
- B. Friday
- C. Sunday
- D. Monday Discuss
- 5. A man can row 8 kmh in still water. If the river is running at 2 kmh, it takes 4 hrs more upstream than to go downstream for the same distance. Then the distance is given by
Options- A. 54 kms
- B. 32 kms
- C. 45 kms
- D. 60 kms Discuss
- 6. The calendar of the year 2024 can be used again in the year?
Options- A. 2030
- B. 2052
- C. 2048
- D. 2036 Discuss
- 7. Find the area of a right-angled triangle whose base is 12 cm and hypotenuse is 13cm.
Options- A. 30
- B. 40
- C. 50
- D. 60 Discuss
- 8. Amithab's average expenditure for the January to June is Rs. 4200 and he spends Rs.1200 in January and Rs.1500 in july.The average expenditure for the months of febraury to July is:
Options- A. Rs. 4250
- B. Rs. 4520
- C. Rs. 4060
- D. None of these Discuss
- 9. In a match, average of runs scored by 7 players is 53. If the runs scored by 6 players are 121, 40, 26, 56, 37 and 48, then how many runs did the 7th player scored?
Options- A. 26
- B. 37
- C. 43
- D. 48 Discuss
- 10. A motorboat can go 10 miles downstream on a river in 20 min. It takes 30 min for this boat to go back at the same 10 miles. Find the speed of the current ?
Options- A. 8 m/h
- B. 5 m/h
- C. 7 m/h
- D. 6 m/h Discuss
More questions
Correct Answer: 125/999
Explanation:
0.125125...... = = 125/999
Correct Answer: 100.9
Explanation:
4.036/0.04 = 4036/40 = 100.9
Correct Answer: 3 kmph
Explanation:
Let the speed of the stream = x kmph
From the given data,
=> x = 3 kmph
Therefore, the speed of the stream = 3 kmph
Correct Answer: Saturday
Explanation:
350 days = (350/7=50 weeks) i.e No odd days,
So it will be a Saturday.
Correct Answer: 60 kms
Explanation:
Let the distance be d.
=> 2d = 120
=> d = 60 kms.
Correct Answer: 2052
Explanation:
NOTE :
Repetition of leap year ===> Add +28 to the Given Year.
Repetition of non leap year
Step 1 : Add +11 to the Given Year. If Result is a leap year, Go to step 2.
Step 2: Add +6 to the Given Year.
Solution :
Given Year is 2024, Which is a leap year.
So, Add +28 to the given year (i.e 2024 + 28) = 2052
Therfore, The calendar of the year 2024 can be used again in the year 2052.
Correct Answer: 30
Explanation:
Height of the triangle = = 5 cm.
Its area = = = .
Correct Answer: Rs. 4250
Explanation:
Amithab's total expenditure for Jan - June = 4200 x 6 = 25200
Expenditure for Feb - June = 25200-1200 = 24000
Expenditure for the months of Feb - July = 24000 + 1500 =25500
The average expenditure = 25500/6 = 4250
Correct Answer: 43
Correct Answer: 5 m/h
Explanation:
As the distance travelled is constant, the time taken is inversely proportional to speed.
Let 'u' be the speed of the current and 'v' be the speed of the boat.
Speed of the boat downstream = v + u & upstream = v - u
=> v+u/v-u = 30/20 => v/u = 5 => v = 5u
=> v + u = 6u = 10/20/60 miles/hr
=> 6u = 30 m/h
=> u = 5 m/h
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