OSSC TGT OSSSC Prelims Mock Test - 3 Free Online Test 2026

The Nobel Prize was first awarded in 1901. The prizes were established by the will of Alfred Nobel, the inventor of dynamite, who left his fortune to establish annual awards in six categories: Physics, Chemistry, Medicine, Literature, Peace, and later, the Economic Sciences. Since 1901, the Nobel Prizes have been awarded annually to individuals and organizations that have made significant contributions in these fields.

Greenland, an autonomous territory of Denmark, is the largest island in the world, covering an area of approximately 2.2 million square kilometers (840,000 square miles).

Acid: The compound that produces hydrogen ion when it dissolved in the solution is called acid.

• The acidic property depends on the concentration of the Hydrogen ion in the solution.

• H+ ion cannot exist alone. It always conjugates with the water and forms hydronium ion(H3O+)

The identification of the acidic or basic nature of any salt solution by the reactions:

• Strong acid + strong base → water + neutral salt
• Weak acid + strong base → water + basic salt
• Strong acid + weak base → water + acidic salt
• Weak acid + weak base → water + salt (It may be a neutral, acidic, or basic depending on the reactants used in the reaction)

EXPLANATION:

• KNO₃ is completely ionized in the water that gives the Nitric acid which is a strong acid. So KNO3 can be used for identifying an acid solution. Hence option 2 is correct.
• The K⁺ is an unreactive ion because it is produced from the dissolution of the strong base (KOH). So K2SO4 can't be used to identify the acidic solution.
• NaCl is a neutral solution that's why we can't use it also.
• Since Na2CO3 is formed by a weak acid Carbonic acid (H2CO3). That's why it can't be used also.

Zaid crops are grown during the summer season and examples include watermelon, muskmelon, cucumber, vegetables, and fodder crops.

Total income of the year = 5 × 21,000 + 4 × 24,000 + 3 × 12,000 + 1,80,000 = 4,17,000

Hence, Option B is correct.

All odd numbers between 5 and 100 = 7 to 99

Hence, Option C is correct.

Bigger number : Smaller number = 27 : 20

Hence, Option B is correct.

Pipe Q alone can fill the tank in

Hence, Option D is correct.

Using Rule 1 :
1st number × 2nd number = L.C. M. × H.C.F,
Required number

AP: 21, 42, 63, 84, …
a = 21
d = 42 – 21 = 21
a(n) = 210
a + (n – 1) x d = 210
21 + (n – 1) x (21) = 210
21 + 21 x n – 21 = 210
21 x n = 210
n = 10

Perimeter of the wheel

Hence, Option B is correct.

The main triangle shown is in the given figure and this the total no. of triangle is 15. remaing triangle we can find out in the drawing the triangle in the image.

Checking Statement I:

Using the above references, we get the information:
 
_ > _ > _ > _ > Tarak > _

Vijay > Komal > Rishi

Here, we cannot merge the above inferences to form a single arrangement of the order of heights of these persons.

So, we cannot say who among these persons is the tallest.

Hence, data in statement I alone is not sufficient.

Checking Statement II:

Using the above references, we get the information:

Rishi > Tarak/Sanjay

So, we cannot say who among these persons is the tallest.

Hence, data in statement II alone is not sufficient.

Checking Statements I and II:

Using the above reference, we get the following arrangement:

Usha > Vijay > Komal > Rishi > Tarak > Sanjay

Clearly, both statements I and II together are sufficient to answer the question.

Hence, Option D is correct.

Checking → statement I:

References:

P is married to U.

V is married to R.

Q is the husband of W.

S is the daughter-in-law of W.

Inferences:

From the above references, we can conclude the following:

So, we can’t conclude the relation between X and S.

Thus, statement I alone is not sufficient to answer the question.

Checking → statement II

References:

V is the father of Q.

U is the mother-in-law of Q.

T is the sibling of X.

T is unmarried.

Inferences:

From the above reference, we can conclude the following:

So, we can’t conclude the relation between X and S.

Thus, statement II alone is not sufficient to answer the question.

Checking → statement I and II:

References:

P is married to U.

V is married to R.

Q is the husband of W.

S is the daughter-in-law of W.

V is the father of Q.

U is the mother-in-law of Q.

T is the sibling of X.

T is unmarried.

Inferences:

From the above references, we can conclude the following:

So, we can conclude that X is the husband of S.

Thus, statement I and II together is sufficient to answer the question.

Hence, option D is correct.

Among the four countries, Japan, Sri Lanka, and Singapore are all island nations, meaning they are entirely surrounded by water. India, however, is a peninsula and is not an island nation. Therefore, India is different from the rest based on this classification.

Thus, the word that is different from the rest is India.

P is male member and married to Q.
P is husband and Q is wife.
R is brother of P.
S is the son of R.
T, who is the sister of S will be daughter of R.
Q is the daughter-in-law of U, whose husband has died means U is the mother of P.

Preparing the family tree using the following symbols:

On decoding L θ Z β T means L is the mother of Z and Z is the sister of T.

i) L is mother of T → True
ii) L is father of T → False (as L is mother of T) 
iii) T is father of L → False (as T is either son or daughter of L)
iv) Z is daughter of T → False (as Z is sister of T)
Hence, 'L is mother of T' is the correct answer.

As Diamond is made of Carbon similarly Ruby is made of Corundum.

User-level threads are very effective because a mode switch is not required to switch from one thread to another. Here is a detailed explanation:

• Definition: User-level threads are managed by the application without the intervention of the operating system. They are created and scheduled by the application itself.


• Advantages: User-level threads offer several advantages, including:




• No mode switch: User-level threads do not require a mode switch from user mode to kernel mode when switching between threads. This makes the context switch faster and more efficient.


• Thread management control: The application has full control over thread management, including scheduling, synchronization, and resource allocation.


• Portability: User-level threads can be easily ported across different operating systems, as they are independent of the underlying kernel.




• Disadvantages: User-level threads also have some limitations:




• Blocking system calls: If a user-level thread performs a blocking system call, it will block the entire process, as the kernel is unaware of the individual threads.


• Limited parallelism: User-level threads may not fully utilize the available hardware resources, as the operating system schedules threads at the process level rather than at the thread level.

In conclusion, user-level threads are very effective because they eliminate the need for a mode switch and provide greater control over thread management. However, they also have some limitations that need to be considered in certain scenarios.

1. Seek time: Seek time is the time taken by the disk drive to position the read/write head to the desired track on the disk. It involves moving the head arm across the platter to access the required data. Seek time is crucial because it directly affects the overall time required to access data on the disk.


2. Rotational time: Rotational time, also known as latency or rotational delay, is the time taken for the disk platter to rotate and bring the desired data under the read/write head. It depends on the rotational speed of the disk and the position of the data on the platter. It is an important factor as it contributes to the overall access time.


3. Transmission time: Transmission time refers to the time taken to transfer the data from the disk to the computer's memory or vice versa. It depends on the transfer rate of the disk and the speed of the data bus. While important, it is not specific to accessing data on the disk.


4. Waiting time: Waiting time refers to the time spent by the disk drive in handling other requests or performing internal operations before it can process the data access request. It includes time spent in the disk queue, waiting for other tasks to complete, or performing internal tasks like error correction. While it can affect the overall system performance, it is not directly related to accessing data on the disk.

The groundbreaking discovery of India's first lithium deposits, estimated at 5.9 million tonnes, was made in Jammu and Kashmir in February. Subsequent modifications to mining rules in July allowed private miners to explore these critical minerals, and reports indicate that the region will auction its lithium reserves in the coming months.

World NGO Day, celebrated annually on February 27, acknowledges the vital role of non-governmental organizations (NGOs) globally. Over 89 countries and 6 continents participate. The day promotes active engagement in NGOs, advocates for collaboration between NGOs and public-private sectors, and raises awareness among the needy about the impactful work of NGOs. The 2024 theme, “Building a Sustainable Future: The Role of NGOs in Achieving the Sustainable Development Goals,” emphasizes their crucial contribution to global sustainability.

Japan hosted the Ukraine reconstruction conference, demonstrating its commitment to Ukraine's reconstruction. Japanese Prime Minister Fumio Kishida emphasized the importance of investing in Ukraine's future during the conference, which saw the signing of over 50 cooperation agreements between Japan and Ukraine.

• The National Conference on Water Sufficient Panchayat, Clean & Green Panchayat and Healthy Panchayat will be held in New Delhi.
• It will showcase best practices followed by Panchayati Raj institutions (PRI) and augment capacity building of elected representatives with greater exposure, interactive learning and experience sharing.