Standing waves are excited in a 1 m long pipe open at one end, closed at the other. Take the speed of the wave as 340 m/s and calculate the frequency of the first overtone (i.e. the first harmonic above the fundamental frequency). 

a. 128 Hz 

b. 170 Hz 

c. 255 Hz 

d. 510 Hz

Which statement is true for the following chemical reactions?

a. CO₂ is oxidized and SnO₂ is reduced 

b. CuCO₃ is oxidized and CuO is reduced 

c. CuO is oxidized and SnO is reduced 

d. SnO is oxidized and CuO is reduced

Human red blood cells (RBCs) cannot be grown in cultures because 

a. RBCs require a steady oxygen supply 

b. RBCs are extremely fragile

c. RBCs are terminally differentiated cells 

d. RBCs are biconcave

In an experiment, two fly populations are separately maintained for many generations. Population A contains closely-related individuals. Population B contains a set of unrelated individuals. Over many generations it is observed that the fitness of individuals in population A is lower than the fitness of those in population B. Why? 

a. Close relatives will not mate with one another 

b. Close relatives compete for common resources more than unrelated individuals 

c. The offspring of close relatives harbour more deleterious recessive mutations 

d. Unrelated individuals are likely to contain new high-fitness genes

You have a system of non-interacting particles that can exist in three possible states, with energy 0, E, 2E (E > 0). At a temperature T = E/k_B (where k_B = Boltzmann’s constant) the energy states are occupied in approximately the ratio 

a. 1 : 1 : 1 

b. 1 : 0.5 : 0.25 

c. 1 : 2.72 : 7.39 

d. 1 : 0.37 : 0.14

In a certain process 1.5×10⁵ Joules of heat is added to an ideal gas to keep the pressure at 2.0×10⁵ Pa while the volume expands from 6.3m³ to 7.1m³ . What is the change in internal energy for the gas?

a. It decreases by 2.0×10⁵ J

b. It increases by 1.0×10₅ J 

c. It increases by 1.0×10³ J 

d. It decreases by 1.0×10⁴ J 

You are running up a spiral staircase. The associated angular momentum points in which direction? 

a. Upwards 

b. Downwards 

c. The net displacement is linear, so there is no angular momentum 

d. The answer cannot be determined from the information given

Gluco kinase phosphor ylates glucose in liver only when glucose levels are higher than normal. What property of glucokinase is responsible for this? 

a. High molecular weight

 b. High Km 

c. High Vmax 

d. Ability to act equally on D- and L-glucose

A charged particle is released from rest in a region where there is a constant electric field and a constant magnetic field. If the two fields are parallel to each other, the path of the particle is a 

a. circle 

b. straight line 

c. helix 

d. parabola

A particle of mass m undergoes harmonic oscillations with period T, about x = 0. Now a force F is applied to the particle, acting opposite in direction to its instantaneous velocity: F = – kv. What happens when the particle is released from rest from some x > 0:

a. It undergoes a steady oscillation with a period larger than T 

b. It undergoes a decaying oscillation 

c. It no longer oscillates, it moves in one direction with decreasing speed 

d. It could oscillate or not, depending on parameter values