# Railway Physics Quiz for RRB ALP Exam |RRB | 15th JANUARY 2019

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Q1. The force exerted by a magnet is an example of _________.

(a) Non-contact force

(b) Muscular force

(c) Contact force

(d) Electrostatic force

Q2. During uniform motion of an object along a straight line, the ________ remains constant with time.

(a) Time

(b)Velocity

(c) Acceleration

(d) Distance

Q3. The impression of an image persists on the retina for about _________ of a second.

(a) 1/10th

(b) 1/8th

(c) 1/16th

(d) 1/5th

Q4. The remove the defect of long sightedness one uses-

(a) Concave lens

(b) Convex mirror

(c) Convex lens

(d) Concave mirror

Q5 Meter in a vehicle that calculates distance covered by the vehicle is called __________.

(a) Speedometer

(b) Odometer

(c) Thermometer

(d) Kilometre

Q6. Density of water is maximum at ______.

(a) 12 degree Celsius

(b) 8 degree Celsius

(c) 4 degree Celsius

(d) 0 degree Celsius

Q7. Which of the following is not a vector quantity?

(a) Work done

(b) Force

(c) Displacement

(d) Velocity

Q8. Terminal velocity ___________.

(a) first increases before decreasing

(b) is constant

(c) first decreases before increasing

(d) always keeps on increasing

Q9. What is the SI unit of pressure?

(a) Newton

(b) Weber

(c) Pascal

(d) Henry

Q10. How can we measure specific gravity of milk?

(a) Using a viscometer

(b) Using an odometer

(c) Using a hygrometer

(d) Using a hydrometer

## Solution

Ans.1.(a)

Exp. The force exerted by a magnet is an example of Non-contact force.

Ans.2.(b)

Exp. Uniform motion is defined as the motion of an object in which the object travels in a straight line and its velocity remains constant along that line as it covers equal distances in equal intervals of time, irrespective of the length of the time.

Ans.3.(c)

Exp. An image stays on the retina for about 1/16 of a second. This feature is called persistence of vision.

Ans.4.(c)

Exp. Farsightedness (Hypermetropia) as it is medically termed is a vision condition in which distant object are usually seen clearly, but close ones do not come into proper focus. To remove this vision problem one should use a convex lens.

Ans.5.(b)

Sol. An odometer or odograph is an instrument for measuring the distance travelled by a vehicle, such as a bicycle or car. The device may be electronic, mechanical, or a combination of the two.

Ans.6.(c)

Exp. When the ice melts to liquid water, the structure collapses and the density of the liquid increases. At temperatures well above freezing, the molecules move faster and get further apart. The density decreases as temperature increases thus, the density of water is a maximum at 4 °C.

Ans.7.(a)

Exp. Work done due to displacement caused by a force is a scalar quantity.

Ans.8.(b)

Exp. Terminal velocity is the constant speed that a freely falling object eventually reaches when the resistance of the medium through which it is falling prevents further acceleration.

Ans.9.(c)

Exp. The SI unit for pressure is the pascal (Pa), equal to one newton per square metre (N/m2, or kg•m−1•s−2). This name for the unit was added in 1971. It is named after the French polymath Blaise Pascal.

Ans.10.(d)

Exp. A hydrometer is an instrument used to measure the specific gravity (or relative density) of liquids. It is also used to measure specific gravity of milk.

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