As an object falls freely its ___________________.

Q:

An echo is returned in 3 s. What is the distance of the reflecting surface from the source, considering the speed of sound as $342 {ms}^{- 1}$ ?

A) 513 m	B) 644 m
C) 342 m	D) 171 m

Answer & Explanation Answer: A) 513 m

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Q:

A 5 kg object is raised through a height of 4 m. The work done by the force of gravity acting on the object is (take g = $10 m / s^{2}$ )

A) 200j	B) 20j
C) -20j	D) -200j

Answer & Explanation Answer: D) -200j

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Q:

Any body kept in a fluid experiences an upward force called _____________.

A) torque	B) moment
C) pressure	D) upthrust

Answer & Explanation Answer: D) upthrust

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Q:

Find the resistance (in mega Ω) of a wire of length 10 m, cross sectional area 1 cm2 and made of a material of resistivity 100 Ωm.

A) 1000	B) 20
C) 500	D) 10

Answer & Explanation Answer: D) 10

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Q:

A charge of 2 C passes from one point to the other in a circuit. If the potential difference between the two points is 5 V, the amount of work done is

A) 5 J	B) 10 J
C) 2.5 J	D) 0.4 J

Answer & Explanation Answer: B) 10 J

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Q:

An object is placed at the centre of curvature of a concave mirror. Its image is formed at

A) a point beyond centre of curvature	B) a point between focus and centre of curvature
C) the centre of curvature	D) the focus

Answer & Explanation Answer: B) a point between focus and centre of curvature

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Q:

The energy released at the end of digestion is in the form of

A) thermal energy	B) electric energy
C) kinetic energy	D) chemical energy

Answer & Explanation Answer: D) chemical energy

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Q:

Which of the following physical quantities changes or tends to change the state of rest or of uniform motion of a body in a straight line?

A) Force	B) Mass
C) Momentum	D) Inertia

A) kinetic energy gets converted into potential energy	B) potential energy gets converted into kinetic energy
C) momentum gets converted into gravitational force	D) gravitational force gets converted into momentum

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