Engineering Set-3: Speed, Velocity & Heat
Engineering Set-3: Speed, Velocity & Heat
Question 1
A car travels 100 meters in 10 seconds. What is its speed?
(1) 10 m/s
(2) 5 m/s
(3) 20 m/s
(4) 25 m/s
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Answer: (1)
Solution: Speed = Distance / Time = 100 m / 10 s = 10 m/s
Question 2
What is the SI unit of velocity?
(1) m/s
(2) km/h
(3) m/s²
(4) N/m
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Answer: (1)
Solution: The SI unit of velocity is meters per second (m/s).
Question 3
A body moves in a straight line with uniform speed. What is its acceleration?
(1) Zero
(2) Positive
(3) Negative
(4) Cannot be determined
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Answer: (1)
Solution: If a body moves with uniform speed in a straight line, its acceleration is zero.
Question 4
Which of the following is a vector quantity?
(1) Speed
(2) Distance
(3) Velocity
(4) Time
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Answer: (3)
Solution: Velocity is a vector quantity as it has both magnitude and direction.
Question 5
What is the difference between speed and velocity?
(1) Speed is a scalar, velocity is a vector
(2) Speed is a vector, velocity is a scalar
(3) Speed is always greater than velocity
(4) Speed is in meters, velocity is in kilometers
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Answer: (1)
Solution: Speed is a scalar quantity, while velocity is a vector quantity.
Question 6
A car travels 150 meters in 5 seconds. What is its speed?
(1) 30 m/s
(2) 20 m/s
(3) 25 m/s
(4) 15 m/s
Show Answer
Answer: (1)
Solution: Speed = Distance / Time = 150 m / 5 s = 30 m/s
Question 7
What is the formula for velocity?
(1) $ v = \frac{s}{t} $
(2) $ v = \frac{d}{t} $
(3) $ v = \frac{a}{t} $
(4) $ v = \frac{f}{t} $
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Answer: (1)
Solution: Velocity is calculated as displacement divided by time.
Question 8
What is the direction of velocity?
(1) It has no direction
(2) It is always positive
(3) It is same as the direction of motion
(4) It is opposite to the direction of motion
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Answer: (3)
Solution: Velocity is a vector quantity and has the same direction as the motion.
Question 9
A body moves in a circular path with uniform speed. What is its acceleration?
(1) Zero
(2) Constant
(3) Changing
(4) Not defined
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Answer: (2)
Solution: Even though the speed is constant, the direction changes, so acceleration is constant in magnitude.
Question 10
What is the SI unit of heat?
(1) Joule
(2) Calorie
(3) Watt
(4) Newton
Show Answer
Answer: (1)
Solution: The SI unit of heat is the joule (J).
Question 11
Which of the following is not a form of heat transfer?
(1) Conduction
(2) Convection
(3) Radiation
(4) Reflection
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Answer: (4)
Solution: Reflection is not a form of heat transfer.
Question 12
Which of the following is a good conductor of heat?
(1) Wood
(2) Plastic
(3) Metal
(4) Glass
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Answer: (3)
Solution: Metals are good conductors of heat.
Question 13
What is the process called when heat is transferred through a fluid by the movement of the fluid itself?
(1) Conduction
(2) Convection
(3) Radiation
(4) Diffusion
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Answer: (2)
Solution: Convection is the transfer of heat through the movement of fluids.
Question 14
Which of the following is a form of thermal energy transfer?
(1) Conduction
(2) Convection
(3) Radiation
(4) All of the above
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Answer: (4)
Solution: All three—conduction, convection, and radiation—are forms of thermal energy transfer.
Question 15
What is the SI unit of temperature?
(1) Kelvin
(2) Celsius
(3) Fahrenheit
(4) Rankine
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Answer: (1)
Solution: The SI unit of temperature is Kelvin (K).
Question 16
Which of the following is an example of convection?
(1) Feeling warm near a fire
(2) Cooking food in a microwave
(3) Heat transfer through a metal rod
(4) Heat transfer through the air
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Answer: (4)
Solution: Convection involves the movement of fluids, such as air or water.
Question 17
What is the term used to describe the transfer of heat through electromagnetic waves?
(1) Conduction
(2) Convection
(3) Radiation
(4) Diffusion
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Answer: (3)
Solution: Radiation is the transfer of heat through electromagnetic waves.
Question 18
What is the process called when heat is transferred from one particle to another without any movement of the particles?
(1) Convection
(2) Radiation
(3) Conduction
(4) Diffusion
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Answer: (3)
Solution: Conduction is the transfer of heat through direct contact without movement of particles.
Question 19
Which of the following is a poor conductor of heat?
(1) Metal
(2) Water
(3) Wood
(4) Glass
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Answer: (3)
Solution: Wood is a poor conductor of heat.
Question 20
What is the term used to describe the transfer of heat through the movement of particles?
(1) Conduction
(2) Convection
(3) Radiation
(4) Diffusion
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Answer: (2)
Solution: Convection involves the movement of particles to transfer heat.
Question 21
What is the process called when heat is transferred from a hotter object to a colder object?
(1) Conduction
(2) Convection
(3) Radiation
(4) Heat transfer
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Answer: (4)
Solution: Heat transfer is the general term for the movement of heat from a hotter to a colder object.
Question 22
Which of the following is a form of thermal energy?
(1) Electrical energy
(2) Chemical energy
(3) Kinetic energy
(4) All of the above
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Answer: (4)
Solution: All forms of energy can be converted into thermal energy.
Question 23
What is the term used to describe the total kinetic energy of the molecules in a substance?
(1) Potential energy
(2) Thermal energy
(3) Kinetic energy
(4) Mechanical energy
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Answer: (2)
Solution: Thermal energy is the total kinetic energy of the molecules in a substance.
Question 24
What is the SI unit of thermal energy?
(1) Watt
(2) Calorie
(3) Joule
(4) Newton
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Answer: (3)
Solution: The SI unit of thermal energy is the joule (J).
Question 25
Which of the following is an example of radiation?
(1) Heat from the sun
(2) Heat from a stove
(3) Heat from a hot plate
(4) Heat from a fan
BETA
