Which one of the following makes a tool with a stick to scrape insects from a hole in a tree or a log of wood?
- A.Fishing cat
- B.Orangutan
- C.Otter
- D.Sloth bear
Correct answer
Explanation
The correct answer is B, Orangutan. Orangutans shape sticks into tools and use them to pull insects, honey and termites out of holes in trees and logs.
Orangutans are great apes of the rainforests of Borneo and Sumatra and are the largest animals that live mostly in trees. Researchers in Sumatra watched them strip twigs, chew the end and push the stick into tree holes to get at insects and honey, a skill young orangutans learn by watching adults. Tool making of this kind was once thought to be uniquely human; it is now known among great apes such as chimpanzees and orangutans, and among some birds such as the New Caledonian crow.
A is wrong: the fishing cat hunts fish by scooping them out of water with its paws and does not make tools.
C is wrong: sea otters may use a stone to crack shells, but they do not fashion sticks to scrape insects.
D is wrong: the sloth bear sucks termites out of mounds with its lips and missing front teeth, without using any tool.
Exam tip: stick tools for insects = orangutans and chimpanzees; stone on shells = sea otter.
Practice Questions
View allA snowboard pulled up by a tow rope travels at the rate of 5 m/s up a mountain. If 3000 watt of power is used, what force was applied to it ?
- A.50 N
- B.100 N
- C.600 N
- D.15000 N
Show answer
Power equals force times velocity, so the force is 3,000 W divided by 5 m/s, which is 600 N. Power is the rate of doing work: P = W/t. Work is force times distance, W = F × d, so P = F × d/t, and since d/t is the…
Read the full explanation →When a longitudinal wave moves through a certain medium, the quantity which is transmitted through the medium is
- A.material of the medium only
- B.energy only
- C.both material of the medium and energy
- D.none of the above
Show answer
A wave carries energy from one place to another, while the particles of the medium only vibrate about their fixed positions.
Read the full explanation →Which one of the following conservation laws is a consequence of the Newton's third law of motion?
- A.Conservation of energy
- B.Conservation of momentum
- C.Conservation of charge
- D.Conservation of mass
Show answer
Equal and opposite forces acting for the same time give equal and opposite changes in momentum, so the total stays the same.
Read the full explanation →Which one of the following properties decreases across the periodic table from left to right and increases from top to bottom?
- A.Ionization energy
- B.Electron affinity
- C.Electronegativity
- D.Atomic radius
Show answer
Atoms get smaller along a period and larger down a group. Moving from left to right in a period, electrons are added to the same shell while the nuclear charge rises by one at each step.
Read the full explanation →A sound wave of frequency of 2 kHz has a wavelength of 35 cm in a given medium. How long will it take to travel a distance of 2.1 km through the medium?
- A.30 s
- B.2.1 s
- C.3.0 s
- D.4.1 s
Show answer
The speed of the wave is frequency times wavelength, 700 m/s, and 2,100 m at 700 m/s takes 3 seconds.
Read the full explanation →