81. When a driver of a moving bus, suddenly applies brakes , the passengers sitting in it fall in the forward direction. This can be explained by
82. For a missile launched with a velocity less than the Earth's escape velocity, the total energy is
83. A body is falling freely under the action of gravity alone in vacuum.Which one of the following remains constant during the fall?
84. Cryogenic engines find applications in
- A. rocket technology
- B. fost-free refrigerators
- C. sub-marine propulation
- D. researches in superconductivity
- Check Answer | Discussion
85. Nearly 30% of the solar radiations return back to the space without contributing anything to the Earth's surface temperature. This amount of radiation is known as
86. You placed a car in an open a parking area in a summer day. After a few hours, you noticed that the heat is trapped inside the car. This phenomenon is known as
87. Which of the following radiations has the highest energy per quantum?
88. Magnet attract magnetic substances as iron, nickel, cobalt etc . They can also repel
89. A close bottle containing water at room temperature was taken to the Moon and then the lid is opened. The water will
90. In an electronic watch the component corrresponding to the pendulum of a pendulum clock is
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