Physics - Study Mode
[#1036] Which of the following is a vector quantity?
Correct Answer
(A) Area
Explanation
Solution: In physics, a vector quantity is a physical quantity that has both magnitude and direction. Area is an example of a vector quantity because it has both magnitude (e.g., square meters) and direction (e.g., the orientation of the area in three-dimensional space). The other options are not vector quantities: Option B: Power is a scalar quantity because it has magnitude but no direction. Option C: Electric Current is a scalar quantity. While it involves the motion of charged particles, it is described by magnitude only. Option D: Energy is a scalar quantity. While energy can be associated with physical processes, it is also described by magnitude only. Option E: None of these is not the correct answer because, as explained, Option A (Area) is indeed a vector quantity. So, the correct answer is Option A: Area , as it is a physical quantity that possesses both magnitude and direction, which are characteristics of vector quantities.
[#1037] Which of the following is not a vector quantity?
Correct Answer
(B) Density
Explanation
Solution: Density is not a vector quantity.
[#1038] Which of the following is not a vector quantity ?
Correct Answer
(A) Speed
Explanation
Solution: Speed is not a vector quantity. It has only magnitude and no direction and hence it is a scalar quantity.
[#1039] These waves cannot be transmitted through vacuum.
Correct Answer
(B) Sound
Explanation
Solution: Sound waves cannot travel in the vacuum of space because there is no medium to transmit these mechanical waves.
[#1040] Hydraulic machines work under the Principle of :
Correct Answer
(C) Pascal's Law
Explanation
Solution: The hydraulic system works on the principle of Pascal's law which says that the pressure in an enclosed fluid is uniform in all the directions.