Railway Physics Quiz for RRB ALP Exam |RRB | 17th JANUARY 2019

Get daily topic-wise Railway Quiz Questions and answers for various RRB exams like NTPC, JE, ALP, Group C and D. Free section-wise Indian railway quiz for RRB Exam.

Q1. If a ball is thrown up, which of the following does not change?

(a) Acceleration due to gravity

(b) Speed

(c) Potential energy

(d) Distance

Q2. The SI unit of intensity of sound is ______.

(a) Watt per square meter

(b) Joule per square meter

(c) Newton per square meter

(d) Tesla per square meter

Q3. To keep drinks at the same temperature for quite sometime, the walls of thermos bottle are coated with:

(a) Aluminium paint

(c) Silver layer

(d) Mercury Layer

Q4. The atmosphere exerts enormous pressure on us. But, we do not feel it because

(a) Our blood exerts a pressure slightly more than that of the atmosphere

(b) We are used to it

(c) Our bones are very strong and can withstand the pressure

(d) The surface are of our head is very small

Q5. The sensation of weightlessness in a spacecraft in an orbit is due to the –

(a) Absence of gravity outside

(b) Acceleration in the orbit which is equal to the acceleration due to gravity outside

(c) Presence of gravity outside but not inside the spacecraft

(d) Fact that spacecraft in the orbit has no energy

Q6. It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because –

(a) weight of buckets are balanced

(b) centre of gravity falls within the body

(c) centre of gravity and centre of equilibrium fall within the feet

(d) resultant weight of buckets is zero

Q7. In a nuclear reactor, one of the following is used as a fuel?

(a) Coal

(b) Uranium

(d) Diesel

Q8. Tungsten is used for the manufacture of the filament of an electric bulb, because –

(a) it is a good conductor

(b) it is economical

(c) it is malleable

(d) it has a very high melting point

Q9. Moving Electric Charge produces –

(a) Magnetic field

(b) Sound waves

(c) Light rays

(d) Heat waves

Q10. Kerosene rises in the wick of the stove is due to –

(a) Osmosis

(b) Diffusion

(c) Surface tension

(d) Biogen contraction

Solution

Ans.1.(a)

Exp. When a ball is thrown upwards the acceleration due to gravity remains constant throughout. It comes to rest for a moment at the highest point of motion just before returning back to earth.

Ans.2.(a)

Exp. The SI unit of intensity, which includes sound intensity, is the watt per square meter (W/m2).

Ans.3.(c)

Exp. The glass or steel which is used in thermos bottle is coated with a silver layer to keep drinks at the same temperature for some time.

Ans.4.(a)

Exp. The atmosphere exerts enormous pressure on us but we do not feel it, because our blood exerts pressure slightly more than that of the atmosphere. We feel this pressure in water because the pressure underwater is greater than our normal blood pressure.

Ans.5.(b)

Exp. The sensation of weightlessness in a spacecraft in an orbit is due to the acceleration in the orbit which is equal to the acceleration due to gravity outside.

Ans.6.(c)

Exp. It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because centre of gravity and centre of equilibrium fall within the feet.

Ans.7.(b)

Exp. Uranium is used as fuel in nuclear reactors.

Ans.8.(d)

Exp. Tungsten is used for the manufacture of the filament of an electric bulb due to its high melting point of 3422 °C.

Ans.9.(a)

Exp. A charged particle moving without acceleration produces an electric as well as a magnetic field.

Ans.10.(c)

Exp. Kerosene oil rising in the wick of the stove is due to the surface tension of oil. The wick of the lamp has many holes which act as capillaries. So kerosene keeps on rising in the capillaries.

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