General Practice Test 2 Nddc Scholarship

The speed of light in a vacuum is a fundamental physical constant. In imperial units, it is approximately 186,282 miles per second, which is commonly rounded to 186,000 miles per second for general calculations. This value is very close to 186,300 miles per second, which is sometimes used as an approximation. In the metric system, the exact value is \(\displaystyle 299,792,458\) metres per second. This extremely high speed allows light to travel around the Earth multiple times in just one second.

Each option must be checked against the given constraints while ensuring that A is already selected as one of the bookkeepers.

In the option ABDGH, the selected secretaries include D and G together. This directly violates constraint III, which states that D and G should not go together. Since this rule is broken, the combination is invalid.

The other options do not violate any of the listed constraints when properly checked. Therefore, ABDGH is the only grouping that cannot form a valid working unit.

Let the number of bicycles be \(\displaystyle b\) and the number of tricycles be \(\displaystyle t\).
The total number of cycles gives: \[ b + t = 10 \] Each bicycle has 2 wheels and each tricycle has 3 wheels, so: \[ 2b + 3t = 25 \] From the first equation: \[ b = 10 - t \] Substitute into the second equation: \[ 2(10 - t) + 3t = 25 \] \[ 20 - 2t + 3t = 25 \] \[ 20 + t = 25 \] \[ t = 5 \] Thus, there are 5 tricycles.

Let the capacity of the tank be \(\displaystyle 60\) units (LCM of 20, 30, and 15).
Efficiency of A = \(\displaystyle 60/20 = 3\) units/min.
Efficiency of B = \(\displaystyle 60/30 = 2\) units/min.
Efficiency of C = \(\displaystyle -60/15 = -4\) units/min.

In a 3-minute cycle (A, then B, then C): \[ 3 + 2 - 4 = 1 \text{ unit} \] After 55 cycles (\(\displaystyle 55 \times 3 = 165\) minutes), the tank contains 55 units.
At minute 166, A adds 3 units giving 58 units.
At minute 167, B adds 2 units giving 60 units, which fills the tank completely.

When the passenger train overtakes the freight train, both have covered the same distance.
Distance covered by passenger train: \[ 16 \times 4 = 64 \text{ km} \] The freight train had a head start of 2 hours, so total time travelled is: \[ 4 + 2 = 6 \text{ hours} \] Speed of freight train: \[ \frac{64}{6} \approx 10.67 \text{ km/hr} \] Thus, the freight train's average speed is approximately 10.67 km/hr.

Graphite is a form of carbon with a layered structure where atoms are arranged in hexagonal patterns. These layers can easily slide over each other, making graphite soft and suitable for writing. It leaves a visible mark on paper, which is why it is used in pencils. Despite commonly being referred to as 'lead', pencils actually contain graphite mixed with clay.

Mary Onyeali-Omagbemi was a dominant sprinter in Africa during the 1990s. She achieved significant success in international competitions, including winning medals at the Olympics and Commonwealth Games. Her consistent performance and record-breaking runs established her as the leading female sprinter in Africa during that decade.

Let the total distance be \(\displaystyle D\).
After day 1, remaining distance: \[ D - \frac{D}{2} = \frac{D}{2} \] After day 2: \[ \frac{D}{2} - \frac{1}{3} \times \frac{D}{2} = \frac{D}{3} \] After day 3: \[ \frac{D}{3} - \frac{3}{4} \times \frac{D}{3} = \frac{D}{12} \] After yesterday: \[ \frac{D}{12} - \frac{1}{2} \times \frac{D}{12} = \frac{D}{24} \] Given remaining distance is 5 miles: \[ \frac{D}{24} = 5 \Rightarrow D = 120 \] Thus, the total distance is 120 miles.

Leap years occur every 4 years, but century years must be divisible by 400 to qualify. The year 1900 is divisible by 100 but not by 400, so it was not a leap year and did not have February 29. Therefore, the stated birth date is impossible, making any age calculation invalid.

The Nigerian Civil War began in July 1967 and ended in January 1970. Counting this duration gives approximately 2 years and 6 months. This period included intense conflict and significant humanitarian challenges before the war concluded with the surrender of the secessionist region.