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Question 1 of 5
1. Question
In Cricket, fast bowlers often shine only one side of the cricket bowl to generate swing. Which of the following could be reason?
Correct
Solution: A
The rough side slows down the air due to friction whereas the smoother side allows the air to pass by at a greater speed. The greater the air speed, lesser the pressure. So there is a pressure differential that pushes the ball in the direction of the smoother side.Incorrect
Solution: A
The rough side slows down the air due to friction whereas the smoother side allows the air to pass by at a greater speed. The greater the air speed, lesser the pressure. So there is a pressure differential that pushes the ball in the direction of the smoother side. -
Question 2 of 5
2. Question
Consider the following statements regarding LED TVs.
1. They utilize liquid crystal display technology.
2. The screen is lit by fluorescent tubes.Correct
Solution: A
LCD stands for “liquid crystal display” and technically, both LED and LCD TVs are liquid crystal displays. The basic technology is the same in that both television types have two layers of polarized glass through which the liquid crystals both block and pass light. So really, LED TVs are a subset of LCD TVs.
LED, which stands for “light emitting diodes,” differs from general LCD TVs in that LCDs use fluorescent lights while LEDs use those light emitting diodes.
Also, the placement of the lights on an LED TV can differ. The fluorescent lights in an LCD TV are always behind the screen. On an LED TV, the light emitting diodes can be placed either behind the screen or around its edges.
The difference in lights and in lighting placement has generally meant that LED TVs can be thinner than LCDs, although this is starting to change. It has also meant that LED TVs run with greater energy efficiency and can provide a clearer, better picture than the general LCD TVs.Incorrect
Solution: A
LCD stands for “liquid crystal display” and technically, both LED and LCD TVs are liquid crystal displays. The basic technology is the same in that both television types have two layers of polarized glass through which the liquid crystals both block and pass light. So really, LED TVs are a subset of LCD TVs.
LED, which stands for “light emitting diodes,” differs from general LCD TVs in that LCDs use fluorescent lights while LEDs use those light emitting diodes.
Also, the placement of the lights on an LED TV can differ. The fluorescent lights in an LCD TV are always behind the screen. On an LED TV, the light emitting diodes can be placed either behind the screen or around its edges.
The difference in lights and in lighting placement has generally meant that LED TVs can be thinner than LCDs, although this is starting to change. It has also meant that LED TVs run with greater energy efficiency and can provide a clearer, better picture than the general LCD TVs. -
Question 3 of 5
3. Question
When we travel by bus or train, we notice that objects which are nearer to us move faster than the objects which are far. Which of the following explains the above observation?
Correct
Solution: B
Relative velocity remains same between the moving bus/train and the objects. However it is the angular velocity of the objects with respect to the moving vehicle that varies with distance. It decreases with increasing distance from the moving objects. That`s why objects at distance appear moving slow as compared to nearer objects. Here one can see that angular velocity is inversely proportional to distance(r).Incorrect
Solution: B
Relative velocity remains same between the moving bus/train and the objects. However it is the angular velocity of the objects with respect to the moving vehicle that varies with distance. It decreases with increasing distance from the moving objects. That`s why objects at distance appear moving slow as compared to nearer objects. Here one can see that angular velocity is inversely proportional to distance(r). -
Question 4 of 5
4. Question
Which of the following phenomenon is observed due to Doppler Effect?
1. Increase in sound of Car Siren when it is approaching
2. Redshift
3. Neutron bombing in Nuclear Reactors
Select the correct answer using the codes below.Correct
Solution: A
The Doppler Effect (or Doppler shift) is the change in frequency of a wave (or other periodic event) for an observer moving relative to its source. For e.g. it causes a car engine or siren to sound higher in pitch when it is approaching than when it is receding.
The Doppler Effect for electromagnetic waves such as light is of great use in astronomy and results in either a so-called redshift or blueshift. It has been used to measure the speed at which stars and galaxies are approaching or receding from us; that is, their radial velocities.Incorrect
Solution: A
The Doppler Effect (or Doppler shift) is the change in frequency of a wave (or other periodic event) for an observer moving relative to its source. For e.g. it causes a car engine or siren to sound higher in pitch when it is approaching than when it is receding.
The Doppler Effect for electromagnetic waves such as light is of great use in astronomy and results in either a so-called redshift or blueshift. It has been used to measure the speed at which stars and galaxies are approaching or receding from us; that is, their radial velocities. -
Question 5 of 5
5. Question
If a ship moves from seawater to freshwater, it will
Correct
Solution: A
The ship is floated by the buoyant force of the water upwards. It is proportional to the density of water. Higher the density, like seawater, greater is the upward force on the ship (cancelling its weight downwards), and higher it its level. Freshwater has lower density, hence the ship will sink down a little bitIncorrect
Solution: A
The ship is floated by the buoyant force of the water upwards. It is proportional to the density of water. Higher the density, like seawater, greater is the upward force on the ship (cancelling its weight downwards), and higher it its level. Freshwater has lower density, hence the ship will sink down a little bit