Fast & Furious.

Which of the following is an example of a non- uniform accelerated motion?

• Freely falling body

• Movement of a fan

• A roller coaster

• The motion of a ball rolling down an inclined plane

Ozone saves the biosphere by absorbing high energy radiations called __________.

• Infra-red (IR)

• Gamma rays

• Ultraviolet rays (UV)

• 
  X-rays

It is difficult to cut things will a blunt knife because

• The pressure exerted by knife for a given force increases with increase in bluntness

  
  

• A sharp edge decreases the pressure exerted by knife for a given force

  
  

• A blunt knife decreases the area of intersection

• A blunt knife decreases the pressure for a given force 

উক্ত রোগটি কোন ধরনের পুষ্টি উপাদানের অভাবে হয়ে থাকে?

• ১. আয়রন

• ২. ভিটামিন - এ

• ৩. ভিটামিন - ডি

• ৪. প্রোটিন

• ৫. আয়োডিন

A bus travels at a speed of 50 km/h to go from its origin to its destination at a distance of 300 km and travels at a speed of 60 km/h to return to the origin. What is the average speed of the bus?

• 54.55 km/h

• 55 km/h

• 55.55 km/h

• 54 km/h

25. Guess the correct answer if 1+4 = 5; 2+5 = 12; 3+6 = 21; 8+11 = ?

• 5

• 12

• 21

• 96

Answer explanation

Answer:  1+4 = 4×1+1 = 5

2+5 = 5×2+2 = 12

3+6 = 6×3+3 = 21

8+11 = 11×8+8 = 96

31. When I was four years old, my sister was half my age. Now, I am 18. How old is my sister now?

• 9

• 12

• 14

• 16

• 4

32. Harry had six siblings. All of them have two years of age difference. The youngest is Jessy, his seven years old sister, while Harry is the most senior. Calculate Harry’s age.

• 18

• 19

• 20

• 21

• 17

Answer explanation

Answer:  The youngest sibling, Jessy, is seven years old. Harry has six siblings, which means they are a total of 7 siblings, and Harry is the eldest among them. All of them have two years of age difference, which means that adding six times two to seven can give us an answer. 7 + 2 + 2 + 2 + 2 + 2 + 2 = 19; so, Harry is 19. 

35. Angel visited a fair near her home. She traversed on her new bicycle presented by her father for winning the art contest. After reaching the fair, Angel noticed that 14 bicycles and tricycles were parked. The total number of wheels in the parking area is 38. Can you find the number of tricycles that were parked there?

• 10

• 11

• 13

• 14

• 55

Answer explanation

Answer: Total bicycles and tricycles = 14

Total number of wheels = 38

All the cycles have minimum wheels, 14 X 2 = 28; 

38 – 28 = 10

There are ten extra wheels other than bicycles, meaning ten tricycles.

How many vertices are present in a cube? 

• 6

• 4

• 8

• 10

• 12