Physics Past Questions and Answers

Question 4736:

A uniform beam HK of length $10\mathrm{m}$ and weighing $200\mathrm{N}$ is supported at both ends. A man weighing, $100\mathrm{N}$ stands at a point $P$ on the beam. if the reactions at $\mathrm{H}$ and $\mathrm{K}$ are respectively $800\mathrm{N}$ and $400\mathrm{N}$, then the distance HP is ____________

A. $4\mathrm{m}$
B. $3\frac{1}{3}\mathrm{m}$
C. $3m$
D. $6\frac{2}{3}\mathrm{m}$
E. $7\mathrm{m}$

Question 4737:

What are the units of thermal conductivity?

A. Kg.m.sec ${}^2$
B. Joule. ${\sec }^{-1}{\mathrm{m}}^{-1}{\mathrm{k}}^{-1}$
C. $\mathrm{kg}\cdot \mathrm{m}$
D. Newton. ${\sec }^{-1}{\mathrm{m}}^{-1}{\mathrm{k}}^{-1}$
E. $m^1$

Question 4738:

A $500\mathrm{kg}$ car which was initially at rest travelled with an acceleration of $5\mathrm{m}/{\mathrm{s}}^2$, its kinetic energy after 4 seconds was ____________

A. ${10}^5\mathrm{J}$
B. $2.5\times {10}^3\mathrm{J}$
C. $2\times {10}^3\mathrm{J}$
D. $5\times {10}^3\mathrm{J}$

Question 4739:

An air force jet flying with a speed of $335{\mathrm{ms}}^{-1}$ went past an anti-aircraft gull. How far is the aircraft Ss later when the gun was fired?

A. $8.38\mathrm{m}$
B. $3.350\mathrm{m}$
C. $670\mathrm{m}$
D. $1675\mathrm{m}$
E. $67\mathrm{m}$

Question 4740:

In a D.0 circuit a 10 microfarad (mf) capacitor is placed in series with a 10-ohm resistor. The total resistance of the combination is ____________

A. 10 ohms
B. 1 ohm
C. Zero
D. 20 ohms
E. Infinite